Antique 2.19 Carat White Opal and 2.36 carat Diamond Cluster Ring in Opal and Diamond Cluster Ring at 1stDibs Antique 2.19 Carat White Opal and 2.36 carat Diamond Cluster Ring in Long Oval Opal Diamond Cluster Ring 7850 Fine Opal Jewelry Natural Opal and Diamond 18 Carat Gold Cluster Ring For Sale at 1stDibs. A lovely white gold cluster ring. Features to the centre an oval white opal, 9x7mm, with an excellent play of colour. Retained by claws, and has an outer border of ten brilliant cut white diamonds, each 3mm diameter (estimated total one carat), colour H j, clarity Si. Head measures 14x12mm, depth 6mm, weight 4. 4grams. Purchased overseas, tests as 18 carat white gold, in almost near new condition with no wear at all. Size P, we can resize free of charge.