1.69 ct. Oval, Rich Deep Forest Green Tourmaline [TU-168] $101.00

Shape = Oval Color = Rich Deep Forest Green Clarity = Eye Clean Size = 9.4x6.5 Weight = 1.69

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.