Post subject: A Synthetic Diamond Overgrowth on a Natural Diamond
Posted: Wed May 03, 2017 1:45 pm
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Joined: Sun Oct 16, 2005 12:22 pm Posts: 21600 Location: San Francisco
Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson, and Wuyi Wang at GIA wrote:
A Synthetic Diamond Overgrowth on a Natural Diamond
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).
Post subject: Re: A Synthetic Diamond Overgrowth on a Natural Diamond
Posted: Wed May 03, 2017 7:29 pm
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Joined: Sun Oct 16, 2005 12:22 pm Posts: 21600 Location: San Francisco
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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