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GIA discovers first hybrid natural-synthetic blue diamond

Posted by: Leo Muller
Date: 5/7/2017

The GIA (Gemological Institute of America) made an alarming discovery: A natural white diamond covered by a tiny 80 microns synthetic layer that colors it blue.

This is the first time the GIA discovers such a diamond, and be warned that more such composites might be on the market.

The 0.33-carat stone is a composite of CVD synthetic Type IIb diamond overgrowth on a natural Type Ia diamond.

CVD diamond films have been applied to natural diamonds since the 1960s, and the successful addition of CVD-grown diamond layers on top of mined diamonds happened in 1993. But this is the first time the GIA finds this under a Fancy color grade. A fancy blue diamond is very rare and costly.

Being such a small diamond, this may have been a first attempt to find if the GIA would be able to see through this deception.

The GIA found out after finding that this diamond had both the common nitrogen pollution, and the very rare boron atoms which make it blue. It is very unusual to see both nitrogen and boron defects in a single diamond, and that is what caused the reason to thoroughly investigate the inner makeup of this diamond.

The full article can be found here: https://www.gia.edu/gems-gemology/summer-2017-labnotes-synthetic-diamond-overgrowth-natural-diamond

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