Color diamonds are more valuable and desirable and a better investment

In 1993, Eyal Cohen started his career as a diamond cutter, sitting by his father’s side as an apprentice. 4 years later, he was recruited by a jewelry firm, where he learned to appreciate natural colored diamonds. In 2003, Eyal opened his own company...

17 september 2018

Debate on the main issues affecting the diamond business is absolutely critical - Ernie Blom

Having taken part in the fruitful discussions with the world leaders at the Asian Summit held recently in Vladivostok, Ernie Blom, President, World Federation of Diamond Bourses (WFDB) now looks forward to taking the worthy inputs received at...

10 september 2018

Reflecting the nature of the industry, US jewellery market is significantly seasonal with great ‘ebb and flow’ in demand, opines Vin Lee

Vin Lee, CEO of Beverly Hills-based Grand Metropolitan, a privately-held luxury goods holding company had migrated from Canada as a child. And one can see that it did not take him long to ascend the US luxury world, establishing himself as a formidable...

27 august 2018

Vladimir Zboykov: New times have come for jewelers

How a personal collection of minerals was thrown on the scrap-heap, who is behind the destruction of gemstone consumption culture in Russia and why jewelers will soon have to choose between business and prison – all this was told to Rough & Polished...

20 august 2018

Changing preconceptions in the diamond and financial markets

Eli Avidar is a man on the move…literally. In April, the former Israeli diplomat stepped away from the CEO’s office at the Israel Diamond Exchange, a position he had held for more than two years, and from the Israel Diamond Institute, where he had been...

13 august 2018

Chinese lab spots stone with CVD coating

11 december 2017
A Chinese gemological laboratory has identified a well-concealed synthetic-diamond coating that bolstered the size of a small natural stone.While the lower part of the stone was a colorless, natural diamond, the upper section, including the crown and the top of the pavilion, contained a layer of diamond created using chemical vapor deposition (CVD).
CVD coatings have been present in the industry for many years, but according to the Beijing-based National Gemstone Testing Center (NGTC), which detected the stone said in a statement: “CVD overgrowth, which significantly influences the weight and size of the diamond, is still rarely reported up to now,” and therefore a major concern for the trade.
NGTC also stated that the coating over the brilliant-cut, 0.11-carat, near-colorless diamond was hard to detect, with no features betraying its existence visible using a microscope. The layer was thicker, perhaps indicating an improvement in growth technique there were no blemishes on the stone resembling needle marks.
NGTC gemologists were able to identify the overgrowth with spectroscopic analysis, as well as images were taken using DiamondView technology. However, the lab did not mention how much weight the coating added to the diamond.

Aruna Gaitonde, Editor-in-Chief of the Asian Bureau, Rough & Polished