antique sapphire and diamond ring For Sale at 1stDibs Lot 72 An 18ct diamond and sapphire dress ring, An antique pearl and sapphire dress ring SOLD OUT Beryl Lane Vintage c1940's Royal Blue Synthetic Sapphire Dress Ring Vintage Synthetic Sapphire Dress Ring Rings from Cavendish Jewellers. A 15 carat gold dress ring. The centre a small seed pearl, 3mm diameter. Surrounded by six sapphires, 2.,4mm diameter. Head measures 7. 8mm, weight 1. 3grams. Hallmarks for Birmingham 1921. Size N, we can resize free of charge but please check your size with us first before ordering.