Cutting Information for Specific Gemstones

Subconchoidal Heat Sensitivity: Yes Birefringence (double… Dravite Tourmaline Facet / Faceting Information Dravite Tourmaline Color: Brown, yellow-brown, orange-brown and reddish-brown Moh’s Hardness: 7-7.5 Refractive Index: 1.616-1.652 Critical Angle: 38.23° Specific...

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