An African Invention
Yes, we never heard about it before. Bi-color Tourmaline or Ametrine, maybe, but bicolor Sapphire, where do you find it?
In fact, before Africa became a major source for Sapphire, Bicolor Sapphire was unheard of. Most of Ceylonese and Thai materials never were "Bi-" in color.
Umba mines and other locations in Tanzania, Africa were able to produce this new amazing rare beauty.
UNUSUALLY NATURALLY UNHEATED
A real Bicolor in Sapphire is usually an indication of its unheated natural condition, if heated, the bicolor appearance usually fades.
The best grade of Bicolor Sapphire usually exhibits an obvious Bicolor division that looks like an Ametrine. Usually BI-Colors are Blue- Yellow- Green or Greenish Yellow or Purple. Large Sizes are extremely rare and are classified- if found in large clean crystals among museum pieces.
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