Freshwater Keshi Pearls form when an Oyster rejects the small bead inserted as a nucleus, but still continues to add Nacre, eventually creating a small solid Pearl, which is 100% Nacre. Our Pearls are graded A, A/B, B, B/C or C quality; A being the very best quality, while C, would be medium quality. All measurements are done by the width of the Pearl. Our Pearls are strung on temporary strands and should be re-strung before wearing. Please see our selection of Carded Bead Cords to find a color right for your selection of Pearls.