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Glossary of watchmaking

Sapphire

Saphir | サファイア | 蓝宝石

Sapphire

Sapphire is a precious gemstone (a type of corundum) that ranges in colour from blue to pink to yellow to green to white to purple (mauve sapphire) to pink-orange (padparadscha sapphire). Six-sided asterisms sometimes occur in star sapphires (caused by inclusions of tiny, thin, parallel needles of rutile). Sapphires are related to rubies. Sapphire has a hardness of 9 and a specific gravity of 3.9 - 4.1. Sapphires are often heat treated to improve their colour.