#CL 202 Lab Created Spinel - Safe to Fire. . . . . . .
Laboratory Created Spinel Cabochons Sapphire, Aquamarine and Zircon Blue Color Hardness:8.0 Refractive index:1.728 Specific Gravity:3.64 Dispersion:020 Heat Sensitivity:None
Metal Clay firing test results; Silver 1200F-1HR-OK, Silver 1475F-1HR-OK, Silver 1650F-2HR OK, Bronze 1525F-2HR-OK, Copper 1778F-30min-OK