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Natural London Blue Topaz Ovals
Moh’s Scale Hardness: 8 Specific Gravity: 3.4-3.6 Refractive Index: 1.606-1.638 Treatment: Irradiated Stability/Care: Excellent / Normal Origin: Brazil
6x4mm, 7x5mm, 8x6mm, 9x7mm, 10x8mm, 11x9mm, 16x12mm