THESE ARE SMALLS OF VERY COLOURFULL CHIPS OF GENUINE AUSTRALIAN OPAL THAT HAVE BEEN COLLECTED FROM MINERS AS TOO SMALL FOR INDIVIDUAL CUTTING.THEY ARE MAGIC FOR INSERTION INTO RESIN FOR OPAL EFFECT OR ASSEMBLED IN SOME FORM OF TOURIST GEM PACK.LOTS OF WONDERFULL INTERESTING USES.CHEAP AS CHIPS.SOLD IN 20CT LOTS AND ABOUT 2,000 CTS AVAILABLE