Large pearls are always more expensive than a simi...

Large pearls are always more expensive than a similar, smaller pearl because they take longer to form. Due to the rarity of perfectly round pearls, they are by far the most valuable shape of a cultured pearl. Pearls with high luster and a smooth surface are also among the more desirable value factors.Aug 22, 2011
People Want to Know..What Makes Pearls Valuable? - The Pearl Girls
https://thepearlgirls.com/what-makes-pearls-valuable/