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 Lightning Ridge Black Opal 1.45 cts $40.00 Add to cart Mintabie Semi Black Opal 3.50 cts $250.00 Add to cart Beginner Jeweller Parcel 3 cts $120.00 Add to cart