OPALE

AN AMORPHOUS GEMSTONE THAT SHOWS THE SPECTRAL COLOURS CALLED FIRE ON EITHER A WHITE OR BLACK BACKGROUND. AN ORANGE VARIETY CALLED FIRE OPAL COMES FROM MEXICO AND DOES NOT ALWAYS HAVE THE FIRE OF THE OTHER VARIETIES. OPALS HAVE A HIGH WATER CONTENT – THEY CAN DRY OUT AND CRACK. THUS THEY ARE VERY DELICATE. OPALS HAVE A HARDNESS OF 5.5 TO 6.5 AND A SPECIFIC GRAVITY OF 1.98-2.50