7.0 to 7.5 mm freshwater pearls are the size of a baby aspirin and are the pearls that are typically used for single strand necklaces commonly seen in graduation and sorority photos. Freshwater pearls in this size are also seen in demi fine earrings and necklaces, often accented with gemstones. The larger the freshwater pearl the more valuable it is, since freshwater pearls have a larger amount of nacre per pearl.
See the blog, An Easy Way to Understand Pearl Sizing or A Pearl Picture is Worth a Thousand Words in 2019 to see other pearl sizes.
