OPAL BARGINS DIRECT OFF THE FIELD HIS IS A FIREY DOUBLET.WE CALL THEM BLACK AS THEY ARE MADE FROM CRYSTAL OPAL MINED AT OUR OPERATION IN LIGHTNING RIDGE-THE HOME OF BLACK OPAL.YOU WILL FIND THAT MOST DOUBLETS ON EBAY ARE FROM COOPER PEDY MATERIAL. THE BACKING WE USE IS NATURAL BLACK POTCH.WE GET THESE STONES CUT IN ASIA AS IT COSTS $3-5 PER STONE TO CUT ON THE FIELD. IT TAKES LONGER TO CUT A DOUBLET THAN A STONE.ON THE OPAL FIELD WE USUALLY VALUE A DOUBLET 10% OF A SOLID STONE.REDDISH COLOURS ARE THE HARDEST TO FIND.WE ARE OFFERING THESE BELOW OUR WHOLESALE PRICE SO YOU MAY WIN A BARGIN. WEIGHT 1.64 CTS SIZE 12 X 7 X 3 MM APP 6MM=1/4 INCH