Australian Opal 5mm Round Cabochon 0.27ct
Australian Opal 5mm Round Cabochon 0.27ct Details: GEMSTONE OPAL ORIGIN Australia CARAT WEIGHT 0.27CTS (AVG) SIZE 5 X 5MM FAMILY OPAL HARDNESS 5.5 â?? 6.5 SPECIFIC GRAVITY OPAL REFRACTIVE INDEX 1.39 â?? 1.46 CRYSTAL GROUP AMORPHOUS OPTICAL PROPERTIES DISPLAYS OPALESCENCE CARE WEAR OFTEN AND DONâ??T BEâ?¦