--- title: "How Do You Judge Pearl Quality?" description: "How pearl quality is judged on seven value factors, size, shape, color, luster, surface, nacre and matching, and what each one means for a pearl's value." canonical_url: "https://learnaboutpearls.com/quality/" last_updated: "2026-11-04" last_reviewed: "2026-10-26" reviewed_by: "Simon" publisher: "Unique Pearl" publisher_disclosure: "Learn About Pearls is published by Unique Pearl, a pearl jeweler." --- # How Do You Judge Pearl Quality? **Short answer:** Pearl quality is judged on seven value factors: size, shape, color, luster, surface quality, nacre quality and, for jewelry with two or more pearls, matching. GIA says luster might be the most important. When the other factors are equal, larger pearls are rarer and more valuable, and round is the rarest cultured pearl shape. Thin nacre hurts both luster and durability. The same factors apply to natural and cultured pearls. The same seven factors decide the value of a [natural](https://learnaboutpearls.com/glossary/#natural-pearl) or [cultured pearl](https://learnaboutpearls.com/glossary/#cultured-pearl), or of a piece of pearl jewelry. [1] GIA’s laboratory calls them the 7 Pearl [Value Factors](https://learnaboutpearls.com/glossary/#value-factors) and lists them as size, shape, color, [nacre](https://learnaboutpearls.com/glossary/#nacre), [luster](https://learnaboutpearls.com/glossary/#luster), surface and matching. [2] ## The seven value factors - **Size.** When the other factors are equal, larger pearls are rarer and more valuable than smaller pearls of the same type. [1] [South Sea cultured pearls](https://learnaboutpearls.com/glossary/#south-sea-cultured-pearl) are the largest of the cultured types. [3] - **Shape.** Pearls come in eight basic shapes: round, semi-round, button, drop, pear, oval, [baroque](https://learnaboutpearls.com/glossary/#baroque) and circled. [3] Round is the most difficult shape to culture, which makes it the rarest cultured pearl shape, though well-formed pear, oval and baroque pearls are also prized. [1] See [baroque pearls](https://learnaboutpearls.com/types/baroque-pearls/). - **Color.** A pearl’s color has up to three parts: [bodycolor](https://learnaboutpearls.com/glossary/#body-color), its main color; [overtone](https://learnaboutpearls.com/glossary/#overtone), translucent color over the bodycolor; and [orient](https://learnaboutpearls.com/glossary/#orient), a shimmer of rainbow colors on or just below the surface. Supply and demand set the value of a given color at any time, and fashion and cultural traditions shape which colors people prefer. [1] See [color and overtone](https://learnaboutpearls.com/quality/color-and-overtone/). - **Luster.** Luster might be the most important factor. GIA describes five levels, from excellent, with bright, sharp reflections, to poor, with dim, diffused ones. [1] See [luster](https://learnaboutpearls.com/quality/luster/). - **Surface.** Most pearls show some blemishes. Few or minor ones, or ones hidden by the drill hole or a mounting, have less effect, but many or severe ones can hurt durability and sharply lower value. [1] - **Nacre.** Nacre quality and luster go together. A bead visible under the nacre, or a dull, chalky look, means thin nacre, which affects luster and durability. [1] - **Matching.** In strands, earrings and other jewelry with several pearls, the pearls should usually match in all the other factors. [1] ## Why judging pearls is hard Pearl quality is harder to pin down than a diamond’s. CIBJO notes that pearl quality factors are more complex and delicate than those of any other gem, that personal preferences such as shape and color play a part, and that necklaces add the further question of matching. [4] Names are not standard either. There are no unified standards for pearl color names, and each vendor uses its own. [4] The [grading](https://learnaboutpearls.com/grading/) section explains how labs and producers turn these factors into grades, and the [quality self-check](https://learnaboutpearls.com/tools/pearl-quality-self-check/) walks you through looking at your own pearls. ## Start here 1. [Luster](https://learnaboutpearls.com/quality/luster/) 2. [Color and overtone](https://learnaboutpearls.com/quality/color-and-overtone/) ## Every page in this section - [Luster](https://learnaboutpearls.com/quality/luster/) What luster is, how it is graded, where it comes from in the nacre, and how much it matters. - [Color and overtone](https://learnaboutpearls.com/quality/color-and-overtone/) The colors pearls come in, what overtone and orient mean, and how color affects value. ## References 1. Gemological Institute of America (GIA), Gem Encyclopedia. Pearl Quality Factors. [Source](https://www.gia.edu/pearl-quality-factor) · [Archived copy](https://web.archive.org/web/20261016075647/https://www.gia.edu/pearl-quality-factor) 2. Gemological Institute of America (GIA), Analysis & Grading. How GIA Identifies and Classifies Pearls. [Source](https://www.gia.edu/gem-lab-how-gia-identifies-classifies-pearls) · [Archived copy](https://web.archive.org/web/20260606232640/https://www.gia.edu/gem-lab-how-gia-identifies-classifies-pearls) 3. Gemological Institute of America (GIA), Gem Encyclopedia. Pearl Buyer's Guide. [Source](https://www.gia.edu/pearl/buyers-guide) · [Archived copy](https://web.archive.org/web/20260613185853/https://www.gia.edu/pearl/buyers-guide) 4. CIBJO Pearl Commission (2025). CIBJO Guides Describing and Classifying Natural and Cultured Pearls, the Producing Molluscs & Responsible Pearling. [Source](https://cibjo.org/wp-content/uploads/2025/12/Final-Guide-October-2025-v2-COMPRESSED.pdf) · [Archived copy](https://web.archive.org/web/20260212155210/https://cibjo.org/wp-content/uploads/2025/12/Final-Guide-October-2025-v2-COMPRESSED.pdf) **Written by:** Learn About Pearls editors **Fact-checked:** Learn About Pearls editors, October 26, 2026 **Reviewed by:** Simon, October 26, 2026 **First published:** November 4, 2026 **Publisher:** [Unique Pearl](https://learnaboutpearls.com/about/), a pearl jeweler **Revision history** 1. November 4, 2026: First published. First published **How to cite this page** **APA:** Learn About Pearls editors. (2026). _How Do You Judge Pearl Quality?_ Learn About Pearls. https://learnaboutpearls.com/quality/ **MLA:** “How Do You Judge Pearl Quality?” _Learn About Pearls_, Unique Pearl, November 4, 2026, learnaboutpearls.com/quality/. **Chicago:** Learn About Pearls editors. “How Do You Judge Pearl Quality?” Learn About Pearls. Unique Pearl. Last modified November 4, 2026. https://learnaboutpearls.com/quality/. **BibTeX:** `@misc{lap-quality, title = {How Do You Judge Pearl Quality?}, author = {{Learn About Pearls editors}}, year = {2026}, howpublished = {\url{https://learnaboutpearls.com/quality/}}, note = {Learn About Pearls, published by Unique Pearl}}` Quoting with attribution and a link is welcome. See [how to cite and reuse](https://learnaboutpearls.com/cite/). **Suggest a correction** ## Related pages - [Grading](https://learnaboutpearls.com/grading/): Why there is no single pearl grading system, and how labs, governments and the trade grade pearls. - [Pearl types](https://learnaboutpearls.com/types/): Akoya, freshwater, South Sea, Tahitian and keshi pearls, and where each one comes from.