Tanzanite

Coined as a trade name by Tiffany and Company in 1969, Tanzanite has been accepted as the the common name for heat treated zoisite.

The lovely blue and purple gemstone is native to Tanzania.

But be careful with the gem, especially in rings, as the softness (6.5) means Tanzanite can be damaged more easily than some harder gems Properties

• Crystal System - Orthorhombic
• Hardness - 6 to 7
• Specific Gravity - 3.35
• Refraction - Double
• Refractive Index - 1.757 to 1.779
• Dispersion -
• Birefringence -
• Wearability - Fair to Good
• Special Care - Avoid impact