Blue, Green, Yellow Sapphire - 1.50 ct Browse other auctions View this lot Popular auctions Recommended categories Natural Sapphire ALGT Certificate: 46163750 Weight: 1.
So, a green or yellow star sapphire must form their crystal in a titanium poor environment, yet somehow still have some titanium dioxide inclusions. Natural Sapphire ALGT Certificate: 46163750 Weight: 1.50 ct Shape: Oval Clarity: Transparent Size: 7.22 x 5.85 x 4.04 mm Colour. But if titanium were present in green or yellow, then the result would be bicolor or parti, if not blue.Īsterism in sapphire is caused by silk rutile inclusions, which have a chemical composition of titanium dioxide. red/pink, purple, and padparadscha, I think. It seems for the other colors of sapphire, some titanium can be present without influencing the sapphire's primary color, e.g. For green and yellow coloration the trace element is predominantly iron without titanium. Trace elements of both iron and titanium cause blue coloration, chromium causes red or pink, orange and pad require both iron and chromium, and purple comes from vanadium. The reason why green and yellow star sapphires are rare is due to the lack of titanium. Okay, after looking further into this, I am convinced that you are right. Ask our PriceScope members and industry experts for a second opinion or get lost in the thousands of user-shared diamond and jewelry images for inspiration.
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