Sapphire is a high-purity and high-density, single-crystalline form of aluminum oxide that may contain chromia, titania, yttria, or other dopants. Sapphire is usually transparent or translucent.
Sapphire Sapphire is a high-purity and high-density, single-crystalline form of aluminum oxide, which may contain chromia ... Ruby is chromium-doped sapphire used in optical filters and laser rods.
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