Origin: Coober Pedy, Australia Opal Type: Crystal Opal Shape: Half-Freeform Color: Rainbow Pattern: Ribbon Transparency: Translucent Brightness rating (1-5): 3 Size (mm): 13x6.5x5.5 Weight (ct): 2.95 MOHS Hardness: 5.5 -6.5 Treatment: Non-treated GbG ID: CY58