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Origin: Mexico Gem Type: Opal Color: White, Blue/Green Shape: Oval Cut: Cabochon Size (mm): 6x6 Weight (ct): 1 Setting Type: Sterling Silver MOHS Hardness: 5.5 - 6.5 Treatment: Non-treated GbG ID: MO440P Note: Chain not included. Opal stones are unique, and may differ somewhat from those pictured. We have narrowed them down to distinct variations as best we can. (Please see photos for variations.)