Rectangle-cut corners calcite
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| Gemstone: | Calcite |
|---|---|
| Location of Origin: | Mexico |
| Origin: | Natural |
| Treatments: | None reported |
| Cut Type: | Cushion |
| Weight: | 76.63 cts. |
| Cut by: | John Bradshaw |
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Colourless "rainbow". Rainbow effect from interference colours caused by twinning planes.
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