Orient

Orient is the quality in a pearl in which rainbow-like colors appear to flow across a pearl's surface. This is a rarely seen attribute in pearls and occurs in only a few of the most spherical pearls.

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Sea of Cortez Pearls, Mabes and Keshi from the “Rainbow Lipped Pearl Oyster” Pteria Sterna Exhibiting Orient.
Photo Courtesy of The Sea of Cortez Pearl Blog.