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Heat Treating Sapphires

Need help finding a chart or on heat treating sapphires.
Does anyone know of a website or other location where I could find
this info?

Thanks, Wally

Dear Wally

Ted Themelis’ book “The Heat Treatment of Ruby and Sapphire” is
maybe what you are looking for:

Also check out the article:

“Heat Treating Sapphires from The Anakie district, Australia.”

Last, make sure to pay a visit to Richard Huges’ website