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Posted in response to heat treating sapphires (from rock creek montana) from larry watson on October 05, 2010 at 08:05:48:

Re: heat treating sapphires (from rock creek montana)

...an important thing is to put the corundum inside a crucible filled with of silicon carbide grains, and let the cool down process take place slowly, over numerous hours...
That's how John Sinkankas himself, told me to how handle amethyst...

From Raymond Hietapakka - October 07, 2010 at 09:21:36
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