Hi Dave; Don’t do it. In my opinion, the only stones that should be
considered for being heated with a hot wax tool and “melted” into wax
follow the “red, white, and blue” standard which goes as follows.
The same goes for re-tipping, except beware glass filled (Hmong Su)
rubies, never-before heat treated sapphires (CO2 filled negative
crystals), and badly included diamonds (or those “enhanced” by older
methods of drilling/filling a la Yehuda). Yipes! that’s enough to
make the novice nervous about heating just about anything. . .
David L. Huffman