![]() ![]() Unlike other star sapphires and rubies, the asterism in these stones generally results from exsolution of ilmenite (FeTiO 3) and/or hematite (α-Fe 2O 3) instead of rutile (TiO 2). Black Star Sapphire Surpriseīlack star sapphires primarily come from Kenya, Australia and Thailand. After removal of the varnish with alcohol, it was found that a large portion of the base had been filled with a lead glass. Two large pits on the base were carefully filled with brown dopping varnish. A large black star sapphire was brought in for testing.
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