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A Synthetic Diamond Overgrowth on a Natural Diamond
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Author:  Barbra Voltaire, FGG [ Wed May 03, 2017 1:45 pm ]
Post subject:  A Synthetic Diamond Overgrowth on a Natural Diamond

Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson, and Wuyi Wang at GIA wrote:
A Synthetic Diamond Overgrowth on a Natural Diamond
Image
Figure 1. This 0.33 ct Fancy blue diamond was confirmed to be a composite of CVD synthetic type IIb diamond overgrowth on a natural type Ia substrate. Photo by Sood Oil (Judy) Chia.

Nitrogen is the most abundant defect in natural diamonds. It can be observed as single substitutional atoms or in aggregated forms. Boron, on the other hand, is a rare impurity in natural diamonds. It is very unusual to see both nitrogen and boron defects in a single diamond. GIA’s New York laboratory recently encountered this in a 0.33 ct diamond graded Fancy blue (figure 1).


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Author:  Isi [ Wed May 03, 2017 5:04 pm ]
Post subject:  Re: A Synthetic Diamond Overgrowth on a Natural Diamond

Composite nonsenses are starting here too !

Author:  thomas.adamas [ Wed May 03, 2017 6:18 pm ]
Post subject:  Re: A Synthetic Diamond Overgrowth on a Natural Diamond

I am curious about the facility that did this cvd overgrowth. They had to know that this technique could lead to fraud.

Author:  Barbra Voltaire, FGG [ Wed May 03, 2017 7:29 pm ]
Post subject:  Re: A Synthetic Diamond Overgrowth on a Natural Diamond

The diamond is relatively small. It would likely receive less scrutiny than larger diamonds.
Seems like it might have been an experiment to see what the facility doing the overgrowth could get away with.

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