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Origin: Queensland, Australia Opal Type: Solid Black Opal Shape: Oval Cabochon Color: Green / Blue / Purple Pattern: Pinfire Broad Weight (ct): 0.7 Dimensions (mm): 8x7x2 Brightness rating: 3 Transparency: Opaque MOHS Hardness: 5.5 - 6.5 Treatment: Non-treated GbG ID: BK21 Money back guarantee within 14 days of delivery.