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 Crystal Opal 0.35cts $45.00 Add to cart Lightning Ridge Semi Black Opal 5.50 cts $340.00 Add to cart Queensland Boulder Opal 20 cts $225.00 Add to cart