Star Ruby & Star Sapphire

Chemical Property: Aluminium Oxide with Chromium (Al2O3)
Hardness (Moh's Scale): 9.00
Refractive Index: 1.762 - 1.778
Specific Gravity: 3.97 - 4.05
Dispersion: 0.058 - 0.066
Fire/Heat Resitance: 1100°C - 1300°C

                   Most world-famous star gemstones are either star rubies or star sapphires, though asterism chatoyancy can occur in several other gemstone varieties such as garnet, moonstone, quartz and diopside.

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Color

Shape