#CL 204 Lab Created Blue Sapphire - Safe to Fire . . . .
Synthetic blue sapphire is as beautiful as the best Ceylon sapphire in the world. 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