Massive Large Pearl Bead String - 12mmThese are our largest pearls with many in the string 11 12 mm and one or two slight larger. Which is about as big as you get as far as pearls go unless you spend thousands! Beautiful lustre with very little grooving. All natural. Price is for per 15 inch string. The least expensive cultured pearls today rival the most expensive natural pearls ever found. Natural freshwater pearls occur in mussels for the same reason saltwater pearls occur in oysters.