6.60 ct. Emerald Cut, Rich Medium Forest Green Tourmaline [TU-093] $528.00

Shape = Emerald Cut Color = Nice Rich Medium Forest Green Clarity = Eye Clean Size = 13.5x7.5 Weight = 6.60

Tourmaline Gemstones

• Crystal system: Trigonal
• Chemical composition: Borosilicate complex
• Color: Green
• Hardness: 7.0 - 7.5
• Specific gravity: 3.06
• Refractive index: 1.62 - 1.64
• Dispersion: 0.017
• Pleochroism: pale green, dark green
• Enhancements: Some very dark green and dark blue green tourmalines are heated to lighten their colors. The treatment is permanent and only occasionally performed.