DiamondBuzz
De Beers Sightholders report shortages of large diamonds
Rough diamonds above 5 carats were in tight supply at this week’s sight, customers reported, with explanations ranging from production cuts to ’ strategy of withholding supply. The February trading session saw stable prices in the vast majority of categories, as the miner maintained its policy of not flooding the market, insiders said this week.
The lack of large stones has puzzled some, since De Beers is reportedly sitting on $2 billion of inventories, its largest since the 2008 financial crisis. Many market insiders viewed it as a positive that these sizes were hard to find, reflecting that the categories had sold better in the past few sights. The resultant polished — mostly 2 carats and larger — has performed better in the recent downturn than 0.30- to 2 carat goods.
Some point to a tactical effort by De Beers to limit supply — either to protect the market or to reward sightholders that purchase less sought-after items.
SOURCE: RAPAPORT
DiamondBuzz
CVD Synthetic Fashioned To Imitate A Rough Natural Diamond
The Near-Colorless Stone Is Believed To Be The First Time Creators Of A Synthetic Chemical Vapor Deposition (CVD) Diamond Have Shaped It To Resemble A Rough Diamond
The 6.87-carat near-colorless CVD diamond was shaped to resemble a natural rough octahedral crystal but showed distinct synthetic features under microscopic and spectroscopic analysis.GIA’s tests confirmed the stone’s synthetic origin, noting polishing marks, facet junction roughness, and luminescence patterns inconsistent with natural diamonds.
No evidence currently suggests widespread substitution of synthetics for rough natural diamonds, but existing detection tools could be adapted if such cases increase.
The near-colorless stone is believed to be the first time creators of a synthetic chemical vapor deposition (CVD) diamond have shaped it to resemble a rough diamond, according to an article in the spring issue of the institute’s Gems & Gemology quarterly journal.
Upon investigation with the use of raman spectroscopy, the results confirmed that the material was a diamond, with its near-octahedral shape similar to that of a natural rough crystal. Further analysis showed that it was not a true octahedron, as only one set of opposing faces was parallel. Microscopic observation under differential interference contrast revealed extremely flat faces marked mainly by parallel polishing lines, unlike the growth steps and trigons typically seen on natural octahedral faces. The facet junctions were extremely rough, possibly due to measures taken to improve the color, after which the main faces appear to have been repolished, the institute explained.
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