OPAL BARGINS DIRECT OFF THE FIELD THIS IS A FIREY DOUBLET.WE CALL THEM BLACK AS THEY ARE MADE FROM CRYSTAL OPAL MINED AT OUR OPERARTION 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 AT OUR WHOLESALE PRICE SO YOU MAY WIN A BARGIN. WEIGHT 2.05 CTS SIZE 12 X 8 X 3 MM 6MM=1/4 INCH THANKS FOR LOOKING AT OUR STOCK AND GOOD LUCK WITH YOUR BIDDING