Apr 23, 2015 - Color change and bi-color sapphires are exceptionally rare stones, most ... and the fewer distracting zones of unattractive color, the more valuable the stone. ... Color change and bi-colored sapphire gems can be cut into many ...
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https://books.google.lk/books?id=IOEDAAAAMBAJ&pg=PA112&lpg=PA112&dq=why%20diamond%20gem%20inclsions%20do%20not%20give%20a%20star...
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