925 sterling silver diamond cut segmented rectangle design ring with a gorgeous faceted solitaire oval amethyst stone. The stone set in the middle measures 3/16 inch wide at the widest point. It is available in sizes 5, 6, 6.5, 7, and 8. 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.