Star Sapphire Information: Asterism, Colors, Origins & Value
gemselect.com
Star Sapphire Information: Asterism, Colors, Origins & Value
Explore star sapphire, a captivating gems with a floating six-rayed star effect from rutile inclusions. Learn about its history, properties and more.
Jun 13, 2020
Sapphire Jewelry
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How can GIA scientists know if a natural sapphire has received heat treatment? One clue is through its inclusions. Sapphires that formed in metamorphic rock often contain carbon dioxide fluid inclusions or negative crystals. If heat-treated, the carbon dioxide escapes from these inclusions so that they become empty. When the stone and its inclusions are cooled to below 31.5°C, a visible carbon dioxide vapor bubble forms within the liquid. This vapor bubble and the presence of liquid indicate tha
0:54
How can GIA scientists know if a natural sapphire has received heat treatment? One clue is through its inclusions. Sapphires that formed in metamorphic rock often contain carbon dioxide fluid inclusions or negative crystals. If heat-treated, the carbon dioxide escapes from these inclusions so that they become empty. When the stone and its inclusions are cooled to below 31.5°C, a visible carbon dioxide vapor bubble forms within the liquid. This vapor bubble and the presence of liquid indicate tha
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How can GIA scientists know if a natural sapphire has received heat treatment? One clue is through its inclusions. Sapphires that formed in metamorphic rock often contain carbon dioxide fluid inclusions or negative crystals. If heat-treated, the carbon dioxide escapes from these inclusions so that they become empty. When the stone and its inclusions are cooled to below 31.5°C, a visible carbon dioxide vapor bubble forms within the liquid. This vapor bubble and the presence of liquid indicate tha
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66K viewsSep 27, 2023
FacebookGIA Education
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