Beautiful Australian lightning ridge solid black opal. It weighs 1.21cts. and measures 6.3 x 9.4 mm. It is 3.4mm thick. Gorgeous, all natural and rare material coming from only one place in the world, Lightning Ridge Australia. Two of the pictures show the bottom of the stone and the black matrix that was intentionally left there. Not much of this material is available in the market place right now.