THIS IS A BLACK OPAL FROM LIGHTNING RIDGE AUSTRALIA . OPAL rough IS 7.20 CTS LARGE PIECS IS 15 X 10 X 9 MM . OPAL BLACK ROUGH SHOWS GOOD DARK ELECTRIC BLUE COLOURS AND IS JET BLACK BACK SO ONCE CUT SHOULD ONLY COME UP BETTER . BLACK OPAL IS STILL IN THE ROUGH THUS STRAIGHT FROM MINERS BUSH CAMP WHO SPLIT IT OPEN TO SHOW THE COLOUR

We receive many questions on how we value our rough opal.We value the rough direct from miners and value it at mine cost .The majority of our rough we do not touch in any way ,its direct from mine ,so generally this means we classify rough by eye,so we expect some parcels to cut really good and others that can look promising do not cut well,generally 60-80% of offerings are priced correctly,10% cuts really good and 10% cuts below ,So good luck in picking the right parcel rough for you.

NOTE 6 MM IS 1/4 INCH