Could someone tell how to heat a yellow sapphire from Sri Lanka?
It's a faceted 10 carat unheated sapphire with lab report. The color are already perfect considering it's a well saturated "Orangy Yellow" but it has a "feather" which I don't like.
I've read some reports indicating it should be heated in a reduced atmosphere. Is it possible to turn it into an Orange sapphire? How? Temperature? Time? What temperature will dissolve the feather?
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