CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: A Synthetic Diamond Overgrowth on a Natural Diamond
PostPosted: Wed May 03, 2017 1:45 pm 
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Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson, and Wuyi Wang at GIA wrote:
A Synthetic Diamond Overgrowth on a Natural Diamond
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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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 Post subject: Re: A Synthetic Diamond Overgrowth on a Natural Diamond
PostPosted: Wed May 03, 2017 5:04 pm 
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Composite nonsenses are starting here too !


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 Post subject: Re: A Synthetic Diamond Overgrowth on a Natural Diamond
PostPosted: Wed May 03, 2017 6:18 pm 
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I am curious about the facility that did this cvd overgrowth. They had to know that this technique could lead to fraud.

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 Post subject: Re: A Synthetic Diamond Overgrowth on a Natural Diamond
PostPosted: Wed May 03, 2017 7:29 pm 
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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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