I wouldn't have known that without looking at completed sales on eBay. The ones with little graduation sell for more. I know that graduated is the classic look, but maybe some people regard it as too ordinary or something. I know I went through a long stage where the graduated pearls were boring and even when my mom gifted me a graduated necklace of natural pearls, I took it apart and used about 1/3 of the pearls in other projects. Ahhh, the folly of youth!!! I now wear what is left of it, about a choker's worth with extreme graduation and love it for being natural! though I wish to get more Bahraini pearls to extend it back to what it was- about 22".