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GIA Detects Penetration Twinning in Natural Diamond
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GIA Detects Penetration Twinning in Natural Diamond
The Gemological Institute of America (GIA) recently analyzed a vivid-orangey-yellow natural diamond that displayed penetration growth twinning. The 0.37-carat rough was on loan from the GIA Museum. The diamond showed the symmetrical formation of two crystals of the same mineral – a natural process, according to an article in the spring issue of the institute’s quarterly journal, Gems & Gemology. Diamonds can develop growth twins in two forms: co…
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