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Star sapphire

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Star sapphire is an extremely rare and valuable blue gem found in clusters of sapphires, which are themselves only found in clusters of bauxite.

In Real Life

The "star" pattern that this mineral is known for is caused by rutile (Titanium dioxide: TiO2) crystals that have impregnated the host corundum crystal. Star sapphires are only smoothed into cabochons, as cutting them with facets does not allow the star pattern to be seen.

Ornamental (2☼-15☼)
Agates
Feldspars
Jades
Jaspers
Opals
Quartzes
Tourmalines
Semi-Precious (20☼-30☼)
Beryls
Chrysoberyls
Garnets
Grossulars
Opals
Zircons
Tourmalines
Spinels
Precious (40☼)
Rare (60☼)
See also: DiamondOpalGlassPearlStone