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RAPAPORT… The Gemological Institute of America (GIA) has found a
natural diamond with a synthetic coating that tints it blue – and has warned that
more such hybrids might be on the market.
The 0.33-carat stone, which had been graded fancy blue, had
a thin layer of lab-grown diamond on it, created using chemical vapor
deposition (CVD), the GIA explained in a lab note this week. It w…

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