This ring is decorated with natural amethyst and white quartz. The size is #7 (14mm). The inside of the ring is stamped with 925. Amethyst is a type of quartz, also known as "purple crystal," and is considered the highest-grade quartz. It is quartz colored purple by iron, and because of its color unevenness, those that appear deep and uniform in color are considered to be of higher quality.