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 Post subject: NY lab reports finding more undisclosed synthetics
PostPosted: Mon Aug 12, 2013 11:13 am 
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National Jeweler wrote:
New York--The Analytical Gemology & Jewelry Laboratory (AG&J), the same lab that reported the discovery of a parcel of 243 undisclosed lab-grown yellow melee diamonds, is warning the industry that it recently found synthetic brown melee mixed in a batch submitted as natural.

The New York-based laboratory said Friday that the stones were grown using the chemical vapor deposition process (CVD) but were sold as natural brown type IIa diamonds.

The lab said at the end of July, it graded a batch of 18 diamonds, 17 rounds and one marquise cut, totaling 16 carats and ranging in size from 0.14-0.635 mm, with color ranging from F to gray and clarity of VVS to SI. The diamonds purportedly were mined, HPHT-treated diamonds.

Using its proprietary testing system, which can test melee, AG&J found that 13 of the 18 stones, or 72 percent, were actually CVD-grown diamonds.


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 Post subject: Re: NY lab reports finding more undisclosed synthetics
PostPosted: Mon Aug 12, 2013 2:02 pm 
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Not surprising. I think cvd synthetic diamonds represented as natural will be an ongoing situation.
At least they are "conflict free". :D

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 Post subject: Re: NY lab reports finding more undisclosed synthetics
PostPosted: Wed Aug 14, 2013 4:43 am 
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The same thing was reported from Mumbai even before NY reacted so it seems to be pretty widespread.

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