925 sterling silver diamond cut rose design ring with a stunning faceted solitaire round amethyst stone. The stone set in the middle measures 3/16 inch wide by 3/16 inch tall. It is available in sizes 5, 6, and 7. Amethyst is crystalline quartz in colors ranging from pale lilac to deep reddish-purple, with a relatively high hardness of 7. Amethyst is the birthstone for February.