Different Pearl Types & Colors | The Four Major Types of Cultured …
Perhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colors. Learn about the factors that make pearls so popular and desirable!
Pearl Classification: The GIA 7 Pearl Value Factors
2018年1月26日 · Continued refinement eventually resulted in the development of GIA’s current pearl classification system, called the GIA 7 Pearl Value Factors. This comprehensive pearl classification system offers a detailed description of the appearance of loose pearls, strands, and pearls in jewelry.
Pearl Quality 101 – How GIA Examines and Classifies Pearls - GIA 4Cs
2016年6月28日 · GIA issues two types of pearl reports for loose, strung, or mounted natural or cultured pearls: Identification and Classification Reports. Learn what each report offers and the differences between the two.
What are the main types of cultured pearls ... - GIA
What are the main types of cultured pearls and what are their distinctive characteristics? Akoya pearls are the small white pearls that most people picture when they think of pearls. They are saltwater pearls, and are usually round and white or cream, with a pink overtone and high luster.
Pearl Gemstone | Pearl Stone | Pearl Gem - GIA
Pearls come in eight basic shapes: round, semi-round, button, drop, pear, oval, baroque, and circled. Perfectly spherical pearls and symmetrical drops are the most valued. There are exceptions, though. Well-formed pear, oval, or baroque …
Pearl Gemstone | Pearl Stone | Pearl Gem - GIA
View Gallery. Perhaps the best-loved gems of all time, pearls—natural and cultured—occur in a wide variety of colors. The most familiar are white and cream, but the palette of colors extends to every hue. Natural pearls form around a microscopic irritant in the bodies of certain mollusks.
Meet the Mollusks - Cultured Pearls - GIA 4Cs
2014年6月23日 · Pearls are produced by mollusks – soft-bodied saltwater or freshwater animals possessing one (univalve) or two (bivalve) shells. Mollusks are invertebrates meaning they lack a spine or vertebrae. Scientists estimate there are over 100,000 different species of …
This system applies to nacreous pearls (see figure 1) and exclusively for the three dominant types of saltwater cultured pearls: akoya, Figure 1. The GIA 7 Pearl Value Factors system classifies pearls according to size, shape, color, lus-ter, surface, nacre, …
Pearl Quality Factors - GIA
The qualities that determine the overall value of a natural or cultured pearl or a piece of pearl jewelry are size, shape, color, luster, surface quality, nacre quality, and—for jewelry with two or more pearls—matching.
A Pearl Identification Challenge | Gems & Gemology - GIA
2019年2月1日 · Based on the authors’ experience handling countless pearls of all types, the form of the platy overlapping nacreous structures (i.e., platelet size, spacing, and shape/appearance of the platelet edges—see figure 2) could be considered more indicative of FW than SW.