Unique 14K White Gold Diamond Amethyst Onyx Band Ring. This beautiful piece features one oval natural amethyst, measuring 12 mm by 8 mm and 24 brilliant round diamonds, totaling .20 carats. There are also 4 pieces of custom cut onyx laid over the top of the ring. The top of the ring measures 1/2 of an inch wide. It is a size 7.25. Sizing is available. It weighs 9.1 grams.