80f01b99_d_other_fine_natural_gemstones__Notes
[Gemstone] Tanzanite [Code] H [Enhancement Method] Heated to produce blue/violet color [Use] Usually [Stability] Excellent [Care] Special [Notes] 
Avoid temperature changes
Gemstone Enhancements : Simply Sapphires-Blue Ceylon Sapphires, Untreated Sapphire, and Fine Colored Gems, Sapphires, Tanzanite and other fine natural gemstones
Notes