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  • Nitilar

    02.10.2012 at 22:12

     · Star Sapphire: Is a Variety of: Sapphire: Colors All except red. Fracture Conchoidal, Frequent parting Hardness 9 Cleavage None Wearability Excellent Crystallography Hexagonal (trigonal). Refractive Index Birefringence Colors: All except red.

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  • Jumi

    02.10.2012 at 22:12

    Star sapphires exhibit a special optical phenomenon called asterism. Tiny needles of silk within the sapphire crystal reflect light and form a star sapphire's telltale star. The most common star pattern is a 6-rayed star, although star sapphires with 4 rays and 12 rays have been found. Watch the video for more information on Star Sapphires.

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