61 shares · 6 comments | This sapphire from Sri Lanka contains a large negative crystal with a hexagonal black graphite inclusion surrounded by a liquid. By cooling the stone by a few degrees, a gas phase separates from the liquid ("boiling"). This effect may be used to calculate the minimum formation temperature of the sapphire. | Gubelin Gemmology | Facebook
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61 shares · 6 comments | This sapphire from Sri Lanka contains …
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