26 Jun 2019
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THE RAREST OF RARE
Violet & Purple Fancy Colour Diamonds
By: Diamond World News Service
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Feb 15 2018 1:04PM
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Reference: 16089  

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Argyle Violet Set in a Ring by L.J. West Diamonds
Argyle Violet Set in a Ring by L.J. West Diamonds
As Pantone declared Ultra Violet as the colour of the year, here is a quick look at what an extremely rare purple/violet diamond consists of and some of the most famous ones to be found.

As we bid goodbye to Green, a colour that gave us a plethora of jewels in emeralds, jades, green tourmalines, green onyx, peridots and more, we embrace the rather cosmic Ultra Violet, Pantone’s declared colour of the year. From a journey surrounded by greenery, we are stepping into a world of vibrancy, with Ultra Violet being the chosen colour. While this paves way for an increase in demand for gemstones such as amethysts and tanzanites it could possibly create more curiosity about the rarest of rare ‘violet’ diamonds. As the demand for intense fancy colour diamonds is on the rise anyway, we are going to see a sudden surge of interest in violet diamonds that are a rare occurrence.

Violet – Purple: What’s in a Colour?
The difference between violet and purple may be fractional, but it is still not something that can be neglected. For purple diamonds, Photoluminescence (PL) spectroscopy, a method used to determine the colour of a diamond is at 776.4 nm, commonly found in type IIb diamonds with intensely coloured blue to gray color and in combination with red phosphorescence. Sometime back, GIA tested a 1.42 carat diamond with similar qualities, but with boron concentration of approximately 28 ppb – the stone was classified fancy colour for its intense purple colour – a very rare and natural type IIb diamond. In the industry, violet and purple are often used interchangeably but it is significant to note that violet diamonds have more blue-grey in them while purple diamonds have hints of pink and red in them.

Fancy violet diamonds are extremely rare; even though the colour difference between purple and violet is minute, violet diamonds are perceived to be rarer than purple. They are hardly found in sizes more than 1 carat; in fact, pure violet diamonds without any inclusions or modifications are found from 0.10 carat to approximately 0.30 carat.

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