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GIA CVD
GIA Spots Natural-Synthetic Hybrid Diamond
The Gemological Institute of America (GIA) has discovered a synthetic layer that improved the weight and color
News May 20, 2019 Rapaport News
GIA ruby overgrowth
GIA Spots Lab-Grown Ruby Layer on Natural Stones
Attempts to upgrade the size and color of gemstones using a layer of synthetic material have been around for
News Mar 19, 2018 Rapaport News
Chinese Grading Lab 150 120617
Lab Spots Stone with CVD Coating
A Chinese gemological laboratory has identified a well-concealed synthetic-diamond coating that bolstered the size of a small natural stone.
News Dec 07, 2017 Rapaport News
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