10 - 11 mm pearls are the size of a Tylenol tablet and a common size for a freshwater pearl necklace as a single or multi strand necklace, often combined with gems creating a statement necklace. Pearl necklaces at this size priced ~ $2K and under are typically freshwater pearls. 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.
