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HPHT Process On DIAMONDS: Foundation & Application
Both microchip and nano technology development have significantly increased the importance of lab created diamonds...
By: Dusan Simic & Branko Deljanin
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Oct 24 2006 12:00AM
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Reference: 2162  

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Revolutionary Evolution:

“My hands began to tremble; my heart beat rapidly; my knees weakened and no longer gave support – I knew that diamonds had finally been made by man.”

This is what Dr. Tracy Hall said in December 1954 after the first experiment that led to this sensational discovery. The experiment was successfully repeated, thus enabling the GE team to announce at the press conference in February 1955, that their team of scientists managed to create diamonds in their laboratory. At the end of 18th century it was established for the very first time that diamond and graphite were formed from the same substance. This is what prompted the GE dream of creating diamond from graphite in a laboratory to finally come true, a dream many scientists have had for the last 150 years.

Diamonds – an Industrial Necessity:

The final race started some time around the year 1951 when GE initiated its Super Pressure Project with the aim to develop equipment for the study of chemical reactions under high pressure. This race had lab created diamond as its ultimate goal. On the one hand, the recently finished WWII showed the importance of diamonds as a strategic material, and on the other hand there was science and technology development that increasingly required the use of diamonds, all of this proving that diamonds had become an industrial necessity. By 1954, for instance, 14 million carats of natural industrial diamonds were used in a variety of technology. Today over half a million carats of industrial diamonds are used by industries, of which 90% are lab created.

Both microchip and nano technology development have significantly increased the importance of lab created diamonds.

Color Enhancement by HPHT:

When compared to other industries, the jewelry industry uses insignificant quantities of lab created diamonds. This number, however, is constantly increasing as both the press-type and the HPHT process is also being applied as a color enhancement process of natural diamonds.

Invention of Superior Presses:

The process of building up high pressure is quite simple in theory - volume decreasing leads to pressure increasing. However, this process does not come without its problems as cracking of even the hardest materials can occur. For this very reason, the first assignment the GE team of scientists had was to create a new configuration, i.e. a new press that was able to theoretically endure required pressures and temperatures necessary for the process. This led to the invention of the well-known “belt” press. Subsequent presses evolved from the tetrahedral, to the BARS, to the cubic press.

The most complicated and the most expensive presses used today are the Cubic-type presses used for color enhancement of diamonds for the jewelry industry. These presses build up pressure of 70 Kbar per square inch, at a temperature of around 2500°C. (See figure 1)

Less complicated and therefore less expensive presses are the BARS-type the presses used by synthetic diamond manufacturers producing diamonds for the jewellery industry. These presses increase pressure up to 55Kbar per square inch, at a temperature of around 1500°C.

Two Applications of HPHT Process:

The HPHT process is applied in two general cases:
1. In synthetic diamond production
2. In altering natural diamonds, i.e. color enhancement.

1. Growing Diamonds by HPHT process

The production process of synthetic diamonds takes place in the following way: carbon is placed in a graphite capsule, a seed is inserted on which the diamond crystal will grow and a catalyst is added that enables the crystallization to form. It takes at least two days for 1ct rough to grow and multiple crystals can grow in one capsule. The necessary conditions for transforming graphite into diamond are 55Kbar and a temperature of 1400-1500°C. Our booklet “Laboratory Created Diamonds” by Sharrie Woodring and Branko Deljanin summarizes our research in this field and provides useful information to both professionals and novices.

The most important synthetic diamond manufacturers are AOTC, Chatham and Gemesis. Gemesis is well-known for its beautiful orange-yellow or yellow-orange lab created diamonds, while Chatham, among other things, makes very attractive “bubble-gum” pink lab created diamonds, as well as yellow, blue and pink melee and smaller diamonds. AOTC is strongly present on the market with beautiful blue and fancy yellow lab created diamonds. EGL USA has had the opportunity to observe colorless, even D color with high clarity, lab created diamonds produced by AOTC and as we have monitored the development of lab created diamonds for the last seven years, we are equipped to detect these stones with ease. (See figure 2)

2. Changing Color of Natural Diamonds by HPHT:

The HPHT process is also applied for color enhancement or color alteration of natural diamonds, however, each diamond type will respond in a different manner to this process. (See figure 3)

Type Ia: to produce Green to Yellow & Orange Colors
If a diamond contains aggregated nitrogen in form A or B or both, it can, under certain conditions of HPHT process, disassociate, thus create single substitution nitrogen. The latest researches, and the practice itself, have proved that even aggregate B can disassociate in commercial processes. This process is used for creating green, orange and yellow diamonds, but it is also used as the first step for pink diamonds that are additionally radiated and then anneal. This process is used mainly for smaller diamonds from 0.20ct to 1.00ct; the starting materials are all shades of brown, even with yellow color as modifier too. Clarity has to be high, i.e. not lower than SI1. Due to the size, more stones can be processed at once. After the process, the stones have to be repolished since surface graphitization occurs resulting in opaque or black surface.

Type IIa: to produce Colorless or Pink Colors:
If a diamond contains hardly a measurable quantity of nitrogen, we determinate it as IIa, or if it contains nitrogen only in the form B, we determine it as IaB. These diamonds will, under certain conditions of HPHT process, undergo plastic deformations, or better said, realignment, that will improve its crystal bar thus bringing it to a state closer to equilibrium. The result of this process is removing brown color and getting colorless diamonds from D color downwards. It is also possible to get light pink as the result of a partly improved crystal bar. Diamonds belonging to this group are very rare and represent only 2% of all diamonds, of various sizes.

The only limitation of the process is that the size of the capsule cannot contain diamonds bigger than 70ct. The starting colors are all shades of brown with clarity over SI1. All big stones are processed individually. Surface graphitization occurs and each stone has to be repolished. At costs of about $400 per carat, this process is expensive and until recently was only viable for stones of 1.00ct and larger. However, today stones from .20ct to 1.00ct are also being processed and there are indications that melee sizes are being processed too. (See figure 4)

Type IIb: to produce Blue Color:
If a diamond contains hardly a measurable quantity of nitrogen and an element of boron, these diamonds are determined as the IIb type. Under certain conditions of the HPHT process, the brown color will disappear in the same way as it is described for the previous group, while the existence of boron will result in blue. This group of diamonds is the rarest and represents only about 0.1% of all diamonds. Even large laboratories such as EGL USA where hundreds of thousands of diamonds are observed every year, only a dozen or so natural IIb diamonds have been seen.

The process is identical as for IIa and IIb diamonds, and depending on the boron concentration and the size of plastic deformations, the color will go from light blue to grey blue. The starting color is a shade of brown as described for the group IIa and IaB diamonds while blue is hardly seen at all.

EGL Service for type analysis of Diamonds:

The HPHT process has been commercially available for the last five years and this has increased awareness among jewelers of different diamond types. In most cases jewelers will find clear indications of types by using both the SSEF spotter and the crossed polarization filter. A distinctive flat shape in a rough diamond is also indicative.

The EGL USA laboratories have seen an increased volume of stones being submitted for type analysis. This service is being performed on a FTIR spectroscope; however, even though this analysis will determine type, it does not provide the quantity of nitrogen nor the ratio among aggregates. It is also important to note that EGL USA labs are not involved in the direct consulting and processing of HPHT diamonds, rather we merely perform the service of analysis.

Research at HPHT Facilities:

Before processing, HPHT facilities will closely examine diamonds on a FTIR spectroscope. The results are first discussed with the jeweller before treatment is decided on. The exact conditions under which the process is carried out remain a closely guarded secret although it has been established that results are directly related to both quality and press performances. The cost of a cubic press can be in the region of a million dollars and bears considerable maintenance expense, for example, tungsten anvil replacement. Modern presses have a computerized control system, and this system is firmly enclosed to be protected against explosion and cracking of certain parts.

Testing & identification of HPHT Diamonds:

The evolution of the HPHT process has significantly changed the work and organization of gemology laboratories. Large laboratories test each diamond on many levels. The basic level implies the use of Diamond Sure and CPF (cross-polarized filter) that enable separating Cape diamonds that are in the majority, from the rest. The next control level implies the use of FTIR and UV-VIS spectroscopes. On this level, the majority of Ia HPHT treated diamonds and synthetic diamonds will be identified. The third level is the most complicated, the most time consuming and the most expensive. Apart from in-depth and repeated analyses done with FTIR and UV-VIS, PL spectroscopy is required, and if possible CL as well. All big gem laboratories are able to identify HPHT treatment even though their own identification procedures remain their proprietary secrets.

The EGL USA database is extensive and lists numerous examples of treatments in diamonds ranging from D to J color. This database offers researchers at our labs plenty of opportunities to study and fully comprehend the current process and enables us to anticipate future processes.

Large companies applying the HPHT treatment to diamonds greatly support the research done by the EGL USA labs and sell their products with full disclosure. In most cases retailers will sell their treated goods with disclosure. At the EGL USA labs all diamonds that test positive for HPHT treatment, are laser inscribed.

Upcoming problems for Jewellery Industry:

The most recent problem discovered by EGL USA labs is the detection of small (0.01-0.07ct) laboratory created diamonds set in jewelry). Such small laboratory created diamonds are relatively new on the market as the smallest sizes to date have been in the melee range. In this particular case, these small diamonds were sold as natural diamonds to an unsuspecting retailer. (See Figure 5)

The EGL USA research of the HPHT process has been ongoing for the last seven years, and all results show that this process is a dynamic method that has a great future ahead of it. This applies to the multi-step process as well (HPHT + Irradiation +Annealing) for creating pink and colorless diamonds. This multi-step process does not imply only the combinations of various processes, but also the repetition of the HPHT process under different conditions. Endeavors to Create Perfect Copy:

Our research has shown that treated diamonds have different characteristics today than what they had five years ago. The lab created diamond companies aspire continuously to create the perfect copy of a natural diamond with all its natural characteristics. This evolution affects identification methods in laboratories, but at the same time it justifies the investments all big research laboratories commit to. (See figure 6)

The next article will forecast the future of HPHT technology, how this compares to the CVD technology of growing clean gem quality diamonds as well as the coating of natural diamonds.

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Artak Sargsyan
()
JESSICA SEND ME E-MAIL:VICE-PRESIDENT@ARTHURBROTHERSHLD.COM
Melody Huang
()
I would like to find Diamond Crystal Growth Chamber , ( H.P.H.T.) ( the split-sphere (BARS) press) and diamond press equipment.We want to make Synthetic Diamond , If you can help me please inform me. jinny0302@gmail.com
RAMESHBHAI
(botad)
HELLO i want htpt technology
DIVYESH
(mumbai)
i would like to purchase hpht machine.tell me some information regarding machine price,maintenance,benefit (i.e. why would i like to select your company machine?)etc.
DIVYESH
(mumbai)
i would like to purchase hpht machine.tell me some information regarding machine price,maintenance,benefit (i.e. why would i like to select your company machine?)etc.
girish
(surat)
I want to buy cvd white polished diamond 1 carat above size and d to i color so any one have cvd call me 08469153608
Jani S Tahilramani
(Navi Mumbai)
I want to make a natural LB diamond M-N shade to nearly colourless by applying pressure up to 10000 bars and some chemicals and heat 1500 degrees will my 2-3-4 cent diamonds will lose color? please advise...... 8879219678.mobile. MUMBAI (INDIA).
uday
(surat)
Please, I do already hpht process .but , lowest labour charge make me any one. Please, any one give me hpht process labour address. How much ??????
uday
(surat)
9825763002
uday
(surat)
Please, I do already hpht process .but , lowest labour charge make me any one. Please, any one give me hpht process labour address. How much ??????
shivang patel
(surat)
i would like to Buy HPHT Machine pl give all details and price -
Jani S Tahilramani
(Navi Mumbai)
I would like to know that if I use some mixtures of chemical catalysts and 10000 bars pressure without oxygen (gases are inert) and provide 1500 degrees centigrade temperature will my brown diamond will turn nearly colourless.
akash
(surat)
dear sir, I am interested to buy CVD diamond machine. so I wants to know what will be cost of the machine and production rate of diamond. please send me mail at akash.331993@gmail.com
Er Hitesh Bambharoliya
(Surat)
CVD and HPHT Diamond manufacturer in Surat India. 097 37 27 8887.
Sundar Desai
(Surat)
Dear Sir i want to buy Diamond - Crystal - Growth - Chamber , ( H.P.H.T.) ( the cubic press and the split-sphere (BARS) press) and diamond press equipment After purchasing the machine I want to create a synthetic diamond producer company in dubai i want to make Synthetic Diamond if you can help me please inform me .
shivang patel
(surat)
I Want to make a hthp diamonds so please send me best quotation with list. shivang patel. 09898010625
shivang patel
(surat)
I Want to make a hthp diamonds so please send me best quotation with list. shivang patel. 09898010625
kalpesh
(surat)
I Want to make a hpht diamond so plz send me some quatation of hpht machine plz send me all detail on my mail id kalpeshbharodiya@gmail.com
Sundar Desai
(Surat)
I want to make cvd diamond please send me best quotation with list of all require equipment.+91-9925039923
Anastasia
(Berlin)
I would like to buy HPHT machine. Please send price on _hochu_letat_@bk.ru
DASHRATH JADVANI
(SURAT)
HELLO, WE ALREDY DEVLOP HTHP MACHINE ON TRIAL BASESE. WE MAKE CHANGE IN COLOR 1 TO 2 NO,.ROUGH & POLISE DIAMOND 0091 9824128355
Jessica
(Luoyang)
Luoyang Qiming is the biggest manufacturer of HPHT cubic press machine/synthetic diamond machine in China, please contact me jessica@qmdiamond.com or call me +86 180 3958 6158
Jessica
(Luoyang)
Luoyang Qiming is the biggest manufacturer of HPHT cubic press machine/synthetic diamond machine in China, please contact me jessica@qmdiamond.com or call me +86 180 3958 6158
dk patel
(surat)
Hi . sir i manufacturer real diomond in surat gujrat India now I study hpht prosses diomond I interested production synthetic diomond so you give technical nolege Pl give best advice thanks
dk patel
(surat)
Hi . sir i manufacturer real diomond in surat gujrat India now I study hpht prosses diomond I interested production synthetic diomond so you give technical nolege Pl give best advice thanks
Mr. Mehta
(chennai...Tamil Nadu)
We are interested inHPHTwhite malleediamonds from.02 to .07 CST. Please send me price .address and phone/mobile no.
Mr. Mehta
(chennai...Tamil Nadu)
We are interested inHPHTwhite malleediamonds from.02 to .07 CST. Please send me price .address and phone/mobile no.
Raj Vora
(surat)
I want produce white hthp or cvd diamonds. Pls provide me information of machinery & its materials suppliers.
Anand Kedia
(durgapur)
Hey!!! I am interested in setting up an hpht process entire system. Contact me at anand_kedia2000@yahoo.com , Mobile No.00919332025002
Priyank
(Mumbai)
I m interest to do HPHT process on my diamonds... so kindly give me your process cost & your lab address. so E-Mail me at priyank.gandhi29@gmail.com
Hitesh bhayani
(Mumbai)
I want to set up hpht plant please comtact me
Hitesh bhayani
(Mumbai)
Hey!!! I am interested in setting up an hpht process entire system. Contact me at heet77@gmail.com or +91-9833695777 .
Oguzhan GOKCOL
(Istanbul)
I am interested to sut up a HPHT Dimond production factory. If you have any lead or offers please contact me ogokcol@carboil.com.tr or call me +905333000668
Dilip Kamra
(mumbai)
i would like to Buy HPHT Machine pl give all details and price
jani s tahil
(Navi Mumbai)
I want to make a diamond which is naturally colored to turn colorless
kautil
(SURAT)
I am interested in buying HPHT & CVD Diamonds from a direct manufacturer,i am located in India. KAUTIL PATEL kautil@vishnuexport.com
mg ahmed
(hyderabad)
I want address of hpht in india
Darshan Shah
(MUMBAI)
anyone who wants CVD Diamonds or CVD reactor to grow diamonds please contact me. darshan@dmindia.co.in
bhautik
(surat)
please give me more information about it's press,cell and all other about it.My email id:bhautik101@gmail.com
parvej.mansuri
(khambhat)
I am interested hpht
Jim
(NYC)
Please send me full information we wish to by a HPHT diamond equipment for here 5770year@gmail.com
Raj Shankar
(Mumbai)
I have one Round Brilliant Shape polished stone to offer you. Diamond's 4Cs characteristics is as follows:- Carat Weight: 25.38 Color Grade: E Clarity Grade: VVS2 Stone Make:- Fluorescence: None Cut Grade: Excellent Polish Grade: Excellent Symmetry Grade: Excellent It is GIA Certified Stone. If any party is genuinely interested in stone please contact me to raj.shankar1992@gmail.com
Arvind
(SURAT)
I am interested in HPHT process with full steps and details, can you please send us details with payments and also interested in buying necessary machineries for that. We want to enhance diamond colors from yellow, brown, to white (colorless)Look for your quick and firm reply
Adarsh CHOHAN
(New delhi)
I am interested in knowing the companies doing HPHT Colour enhancement process on type 2a diamonds in the world. Can I have the complete addresses of such companies with their E mail id.
ashok savalia
(surat)
hello,I am askok savalia trim Surat sir I have Req.for hpht process diamond machine.pls info.me on e mail.
Zahef
(Dubai)
Dear Sir i want to buy Diamond - Crystal - Growth - Chamber , ( H.P.H.T.) ( the cubic press and the split-sphere (BARS) press) and diamond press equipment After purchasing the machine I want to create a synthetic diamond producer company in dubai i want to make Synthetic Diamond if you can help me please inform me . I live in UAE . (dubai) mobile: +989151981257 mail: nasr257@yahoo.com Address : Abu dhabi UAE .ALmina .Almina Road .Municipality Building Live Fodder Market.Behinde Fire Brigade.P.O.Box :44308 Zahed baloch Thanks
Munit
(Dubai)
Im interested in buying HPHT Diamonds from a direct manufacturer,im located in India -989151981257. Nasr257@yahoo.com
Munit
(Dubai)
Im interested in buying HPHT Diamonds from a direct manufacturer,im located in India -989151981257
kirit
(bangkok)
hi, this is very intresting machine and i need little more information about the machine that where i have to buy this machine and if i want to process any diamonds than where i can process that??? mo:+660816159033
LAVKISHEN
(MUMBAI)
DEAREST SIR / MADAM , WE ARE LOOKING FOR A RELIABLY GOOD HPHT DIAMONDS PROCESSOR , BEST REGARDS L . B . MEHRA
Adrian Loughrey
(Anapolis, GO Brasil.)
I am interested to set up HTHP process for production of synthetic diamonds for commercial purpose and memorial diamonds kindly request you to send me details of machines required and the price details and from where to buy the machines also..thank you..Adrian John Loughrey.
Shalin
(Surat)
. It's good..
Shalin
(Surat)
. It's good..
Shalin
(Surat)
. It's good..
Shalin
(Surat)
. It's good..
Shailesh
(Ahmedabad)
Dear Sir, As all said I am also interested in HTHP machine, process, cost of plant and market of treated as well synthatik Diamond My Phone No:9898121102
yuvraj mugdiya
(pune)
I am interested in learning more about these..
kamlesh jain
(Coimbatore)
Hi i am interested in buying this machine and please let me know where can i get hpht diamonds in india.thank you
Krishna Prasad
(Visakhapatnam)
Hi, I am interested to buy HPHT-Cubic press for color treatment of diamonds. I have plans to set up this unit in India. Please write to me relevant details on type of services that you can offer and price of the unit. Thank you.
Krishna Prasad
(Visakhapatnam)
Hi, I am interested to buy HPHT-Cubic press for color treatment of diamonds. I have plans to set up this unit in India. Please write to me relevant details on type of services that you can offer and price of the unit. Thank you.
DHEERAJ KUMAR
(jhunjhunu)
Dear Sir,I am interested set up HTHP process for production of synthetic diamond for commercial purpose, please send me details of machines required urgently in jhunjhunu we are a big manufacturers of natural diamond and now we are want to set-up production line up of HTHP - synthetic diamond.please send us a your e-catalogs along with price list if all necessary machinery and cost of machinery at our following mail id, Dheeraj Kumar,jhunjhunu,rajasthan,india-mobile no.-9982609208
mehreen
(dubai)
we want to buy the hpht machine >what is its price and reply asap on my number 00971509118482
Mitul Patel
(Mumbai)
Give Details about HPHT Machine on patelmitulp@gmail.com or 09920760007 as i want to buy few machines for Synthetic Diamond manufacturing.
Mitul Patel
(Mumbai)
hi, I am looking for a Split Sphere / BARS Apparatus for HTHP Diamond Synthesis.
saurabh shah
(surat)
I m interest to do HPHT process on my diamonds from brown to D to H colors & others fancy colors also... so kindly give me your process cost & your lab address. so E-Mail me has will as soon ....my contact number is 9737778000
DINESH GUPTA
(Surat)
I AM LOOKING FOR HPHT MACHINERY
naresh
(mumbai)
Hi iam intrested to buy machinery and techology to produce diamond.Allso HPHT lab adress to convert brown to other colour.
Pradip Thaker
(surat)
Dear Sir,I am interested set up HTHP process for production of synthetic diamond for commercial purpose, please send me details of machines required urgently in surat we are a big manufacturers of natural diamond and now we are want to set-up production line up of HTHP - synthetic diamond.please send us a your e-catalogs along with price list if all necessary machinery and cost of machinery at our following mail id,
Arturo bernal
(cali)
Hi my associates and i, arre interested in buy a few of this machines, you can help with this information, thanks.
Tina Jain
(Mumbai)
Mr Pranab Paul,Kolkata,Mr KK singh,mumbai, shivani Gujarat,vicky,mumbai, sanket, mumbai,Kobus Robbertse, Johannesburg, South Africa, South Africa- please contact tina.jain3142@gmail.com for hpht split sphere machnies for making man made diamonds
vicky
(mumbai)
please mail me the address of the lab who do these kind of process and the manufacturer of types of diamond machine..........
amit
(surat)
I am also interested in obtaining one of these machines or to acquire plans to build one. Could you send me any information that might help to track down information on getting started.
Natasha
(INDORE)
hello friends, please write your contact number/email in text so that We may contact for the HPHT machine.In this post it is not possible to contact you unless you send mail or list your mobile/email here. ornategemsindia@gmail.com
kk singh
(mumbai)
iam intrested buying hpht machine
shivani
(gujrat)
I am interested to set up HTHP process for production of synthetic diamonds for commercial purpose, kindly request you to send me details of machines required and the price details and from where to buy the machines also..thank you..
sanket
(mumbai)
hello natasha plz send details and performance of your machines on be.my.bestfrnd@gmail.com
V Natasha
(Indore)
For split sphere or Toroid type HPHT Press please contact at ornategems@rediffmail.com
V Natasha
(Indore)
For split sphere or Toroid type HPHT Press please contact at ornategems@rediffmail.com
Pranab Paul
(Kolkata)
Dear Sir,I am interested set up HTHP process for production of synthetic diamond for commercial purpose, please send me details of machines required urgently,Dr. Pranab Paul
kumar shri
(dhari)
sir.since last ten year i am trying to made hthp machine at my place and now i am success to produce diamond, very short time i am going to commercial production of machine for market at very low cost..any person intrested to make this type machine please contect me.........thanks.mail to.....thirdeye26560@gmail.com
kumar shri
(dhari)
sir.since last ten year i am trying to made hthp machine at my place and now i am success to produce diamond, very short time i am going to commercial production of machine for market at very low cost..any person intrested to make this type machine please contect me.........thanks.
Jitu
(surat)
I m interest to do HPHT process on my diamonds from brown to D to H colors & others fancy colors also... so kindly give me your process cost & your lab address. so E-Mail me has will as soon ...
Jitu
(surat)
I m interest to do HPHT process on my diamonds from brown to D to H colors... so kindly give me your process cost & your lab address. so E-Mail...
mansukh
(surat)
i want to required your address for HPHT process price list.please mail me and specify your brance.
mansukh
(surat)
i want to required your address for HPHT process price list.please mail me and specify your brance.
mansukh
(surat)
i want to required your address for HPHT process price list.please mail me and specify your brance.
Kobus Robbertse
(Johannesburg, South Africa)
I am also interested in obtaining one of these machines or to acquire plans to build one. Could you send me any information that might help to track down information on getting started.
bhavesh
(mumbai)
I want hpht procces on my 6ct diamond from brown colour to d colour.so you give me procces coast. and your lab address.Email me.
Manann Bhatt
(Bhavnagar)
I am interested to get/purchse the machines for converting/changing the colou rof natural diamonds. I would like to reequest to help me in this matter.
Director , Scott
(MPLS)
I am interest to get one of these machines or to have the plans to build on of these machines. Can you send me any information how to grow a synthetic diamond. Were a non profit company and would be appreciative whatever support/information you could give us. Scott
mohammad
(paris)
dear sir,hello! and sir honesly if i want to buye this machine where i'm buye without being intrusive? the created diamonds HPHT thanks best regard Mr.Mohammad.
Sweekar
(Mumbai)
Im interested in buying HPHT Diamonds from a direct manufacturer,im located in India -9820530114
ousmane kone
(bamako)
I am really interest to get one of these machines and to have explenation of the complete process of how to grow a sinthetic diamond.please to send me some information about it.
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