General Information(not all tested by the author),“Gemstone
Enhancements” Kurt Nassau ISBN 0 7506 1797 7 Corundum: “The Heat
Treatment of Ruby and Sapphire” Ted Themelis ISBN 0-9409-6510-0 Or
check out this mad scientist webpage
http://www.LICCINI.com/Treating/TreatIndex.htm
Mark Liccini
http://www.LICCINI.com