All the rings are American. It's the size of a ring. Please view photos of international dimensions. The ring size 5 = 16 mm diameter size 6 = the United States is about 16.5 mm diameter size 7 = the United States is about 17.5 mm diameter size 8 = 18 mm diameter size 9 = America about 19 mm diameter size 10 = 20 mm diameter size 11 = 20.5 mm diameter size 12 = 21.5 mm diameter size 13 species: = the United States is about 22.5 mm diameter wedding ring sex: female/male 1. Fashion ring set, inspired by love, is the essential jewelry for marriage. 2. Couple wedding rings, classic fashion rings for men and women. 3. Healthy ring, strong antioxidant and hypoallergenic. It can also be used as birthday gifts, anniversary gifts to family, relatives, friends and so on.