The Different Criteria for Pearl Valuation
Pearls are the pearly concretions secreted inside oysters. The trade description, Tahiti Cultured Pearl, is exclusively reserved for pearls produced by a graft of the black-lipped Pinctada Margaritifera oyster of the Cumingui variety. They possess a continuous pearly layer that does not reveal its nucleus, even through transparency.
Pearls are characterized by a diversity of shapes, sizes, surface quality, luster and several shades of natural colors.