Pearl Value Factors, Processing, and Treatments PDF
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Gemological Institute of America
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Summary
This document discusses the factors that determine the value of pearls, including various processing methods and the characteristics of different pearl types. It provides a detailed explanation of key terms, like blemishes, and how they impact the overall quality and aesthetic appeal of pearls.
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Pearl Value Factors, Processing, and Treatments KEY CONCEPTS The GIA Pearl Description System provides a common language for evaluating pearls. Each value factor varies in importance for different pearl types. The rarity of larger pearls is one factor that makes them more valuable. If a pearl color i...
Pearl Value Factors, Processing, and Treatments KEY CONCEPTS The GIA Pearl Description System provides a common language for evaluating pearls. Each value factor varies in importance for different pearl types. The rarity of larger pearls is one factor that makes them more valuable. If a pearl color is in demand and it’s also rare, its value increases. Cool water and a clean environment during growth contribute to improving a pearl’s luster. Very few pearls are completely free of blemishes. Round is the rarest and most valuable cultured pearl shape. Any cultured pearl of significant value must have Acceptable nacre quality. Traditionally, the farther a pearl’s shape is from round, the less valuable it is. A sorter must begin with a huge quantity of pearls to end up with a well-matched group. All pearls display bodycolor, and some also have overtone or orient or both. With all the cultured pearl types available, there’s an affordable type and quality for almost everyone. Key Terms Blemishes—Irregularities confined to a pearl’s surface. Circled pearl—A pearl with one or more grooved or ridged rings all the way around it. Essence d’orient—A mixture of clear varnish and fish scales used in making imitation pearls. Full-drilled—Cultured pearl with a hole drilled all the way through; sometimes called drilled-through. Process—A procedure that includes cleaning, buffing, and sometimes bleaching, done to make cultured pearls presentable and appealing. Three-quarter-cut—Cultured pearl with any unsightly portion cut or ground off. Value factors—Features used to judge the quality and value of pearls. Half-drilled—Cultured pearl with a hole drilled halfway through to permit mounting on a post. 107
