25 Oct 2020
DiamondWorld Directory
Home |
IGI issues alert about CVD synthetic diamonds being submitted to the lab
The lab is consulting with major trade bodies and labs to control such activities
By: Diamond World News Service
May 23 2012 6:27PM
Reference: 6981  


In its recent trade alert for the global gemological community, the International Gemological Institute (IGI) has informed that its laboratories in Antwerp and Mumbai have received a few hundreds of CVD synthetic diamonds with the clear aim to have these man-made diamonds certified as natural diamonds, in the past few weeks.

IGI readily identified these as synthetic diamonds. The laboratory described that in each case the synthetics had very similar characteristics and may therefore have had a common origin.

The CVD synthetics submitted in unusually large numbers were as follows:

Mostly F to J Color, Clarity VVS – VS - Internal characteristics were feathers, pinpoints, small dark crystals. The inclusions are strikingly similar to natural inclusions, hence, microscopic observation is insufficient to conclude.

Sizes - ranged from 0.30 ct to 0.70 ct.

Polish, Symmetry and Cut -either “Excellent” or “Very Good”.

Bruted or faceted girdles.

Absence of any laser inscription.

They were all type IIa and were referred as such by DiamondSure.

All synthetics when tested with DiamondPlus, gave “refer CVD” result. Upon being viewed in DiamondView the synthetics showed bluish green fluorescence and blue phosphorescence, with characteristic striations. Also, they showed moderately strong photoluminescence from H3 and nitrogen-vacancy optical centres (zero-phonon lines at 503 nm and 575/637 nm respectively) and exhibited photoluminescence at 737 nm that is attributed to silicon-vacancy centres.

The lab suspects that the volumes of colorless synthetic diamonds being released on the global markets is increasing , and may perhaps already be prevalent throughout the diamond centres. As such, IGI management decided to liaise and consult with the Belgian Federation of Diamond Bourses (BFDB), DTC Research, and the AWDC. The lab also decided to share detailed scientific information with other gemological laboratories around the world. Trading in misrepresented or undisclosed products, whether inadvertently or not, could cause irreparable damage to the industry’s reputation and undermine the integrity of the diamond supply chain, damaging both trade and consumer confidence.

As such, the lab believes that the recent events call for having ready access to methods for detecting synthetics. Parcels of stones containing unusually high proportions of type IIa’s should be treated with particular caution. CVD synthetic diamonds are undetectable when using only traditional diamantaires’ tools such as loupes and microscopes. Therefore, gemologists’ expertise is of paramount importance. Also, according to IGI, in most cases of the synthetics submitted to the lab, they were purchased at prices that were equivalent to prices of natural diamonds.

Follow DiamondWorld on Instagram: @diamondworldnet
Follow DiamondWorld on Twitter: @diamondworldnet
Follow DiamondWorld on Facebook: @diamondworldnet
Have Your Say
* Your view
* Name:
* Email:
* Town/city:
* Country/State:
Sort by: 
Dr. Jayshree Panjikar, PANGEMTECH-Panjikar Gem Research and Tech Institute, Pune
CVD synthetic diamonds are now very regularly seen the market.. when they are in sizes of 0.30ct. and above they are economically viable for testing. Smaller sizes of synthetic diamonds..stars and melee would be difficult if mixed in large packets of natural diamonds as testing each and every stone with DiamondsPlus or with DiamondView (generally CVD diamonds show redfluorescence) and further testing these tiny stones with FTIR would mean the charges for all these tests would be greater than the cost of the diamond under test!!
*  Company:
*  Name:
*  Mobile:
*  Email:
Subscribe for DiamondWorld weekly Newsletter
HouseAd_Trade Fair
Search News by City
Kosher 23460
HouseAd_Trade Fair
Recent Issue
Kosher 23460
News in Pictures
Young Diamantaires
Pictures: 16
Stunning Jewellery from Cannes 2019
Pictures: 24
Sparkly Jewels at Oscars 2019
Pictures: 19
Golden Globes 2018
Pictures: 15
Spotted: Who Wore What (December 2018)
Pictures: 4
India Diamond Week
Pictures: 8
Spotted: Who Wore What (October 2018)
Pictures: 7
Spotted: Who Wore What (September 2018)
Pictures: 6
70th Emmy Awards
Pictures: 11
35th India International Jewellery Show 2018
Pictures: 46
JJS - IJ Jewellers Choice Design Awards 2015 powered by GIA
Views: 27588
Diamond World Expert Hour with Evgeny Agureev, Deputy CEO, ALROSA
Views: 2324
GJEPC Chairman Interview
Views: 24425
IJ Jewellers Choice Design Awards 2012 - Part 1
Views: 31964
Promo for IJ Awards 2012 at NDTV Profit
Views: 46191
IJ Jewellers Choice Design Awards 2012- Part 2
Views: 58439
Couture India 2016 - A Business Boutique Show by IJ Magazine
Views: 18813
Savjibhai Dholakiya, Surat Businessman (Diamond Merchant) speaks in Vibrant 2015
Views: 44940
IJ Jewellers Choice Design Awards 2013 - NDTV Video
Views: 43138
Kosher 250300
Member of:
Supporter of: