Natural Tourmaline Gemstone, Green Color Trillion Cut, Ring And Jewelry Size Tourmaline Loose Gemstone , 1.55 Carats. Weight : 1.55 Carats Dimensions : 8*7*5 Color: Black, Green, Red, Blue, Pink, Yellow, White, Purple, Grey, Orange, Brown Luster: Vitreous Associated month: October Crystal system: Hexagonal crystal system Hardness (Mohs hardness scale): 7 - 7.5 Transparency: Opaque, Transparent Refractive index: 1.616 - 1.65 Description : Tourmaline is a fairly…