View cart You cannot add another "Lightning Ridge Black Opal 6.30ct" to your cart. Premium Calibrated Opal Round Doublets 4mm (priced individually)$22.50 In stock Premium Calibrated Opal Round Doublets 4mm (priced individually) quantity Add to cart Description Description These opal doublets measure 4 x 4 x 1.5 mm and have prominent green/blue colouring. Related products Sale! Coober Pedy Crystal Opal Parcel 2.90 cts $210.00 $200.00 Add to cart Lightning Ridge Black Crystal Opal 0.35cts $45.00 Add to cart Mintabie Dark Crystal Opal Parcel 3.60 cts $125.00 Add to cart