Opal crystal is the most precious of all Opal. The center stone weighs 4.3 carats This clear opal crystal flashes blue and red. High end stones have such clarity that they can be difficult to photograph the true colors in the stone.The surrounding stones are Emerald, Diamond, Sapphire, Opal Doublets, Green Tourmaline, Tourquoise and Green Chalcedony. Length is aproximately 16 inches.