--- title: "How Long Does It Take to Grow a Pearl?" description: "How long cultured pearls take to grow, from under a year for many Akoya to years for freshwater and South Sea pearls, and why growing time affects nacre." canonical_url: "https://learnaboutpearls.com/farming/how-long-pearls-take-to-grow/" 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 Long Does It Take to Grow a Pearl? **Short answer:** Most saltwater cultured pearls grow for one to two years after the bead goes in, on top of the time it takes to raise the oyster. Akoya pearls are often harvested after 10 to 14 months and Tahitian pearls after 18 to 24 months, while South Sea pearls generally need at least two years. Freshwater pearls usually take one to five years. A longer growing period gives thicker nacre, and often larger pearls. **Key facts:** - Pearl oyster larvae need at least a year and a half to grow large enough for pearl culture, while freshwater mussels are ready within a year. [1] - After the operation, saltwater oysters generally stay in the water for another 1 to 2 years before harvest. [1] - Akoya oysters are typically left in the water for 10 to 14 months, and some Akoya are harvested after less than six months. [2, 3] - Tahitian cultured pearls are harvested after about 18 to 24 months. [4] - Pinctada maxima, the South Sea oyster, generally needs at least two years to grow its pearls. [5] - Freshwater culture usually takes 1 to 5 years, depending on the method and the mussel. [1] - In the 1990s, when some Akoya were harvested as little as six months after the bead went in, complaints surfaced of nacre peeling from pearls with coatings under 0.2 mm. [6] Growing a [cultured pearl](https://learnaboutpearls.com/glossary/#cultured-pearl) takes two kinds of time: raising the oyster or mussel until it is ready for the operation, and then growing the pearl inside it. The page [how pearls form](https://learnaboutpearls.com/basics/how-pearls-form/) explains the biology; this page explains the timings. ## Before the pearl: raising the mollusk A pearl farm has to wait before it can start a pearl. [Pearl oyster](https://learnaboutpearls.com/glossary/#pearl-oyster) larvae need at least a year and a half to grow to a size suitable for pearl production, while freshwater mussels grow much faster and are ready within a year. [1] Most [Akoya](https://learnaboutpearls.com/glossary/#akoya) oysters are bred in hatcheries and raised for 2 to 3 years before they receive a bead. [7] ## The first weeks after the operation The weeks after [grafting](https://learnaboutpearls.com/glossary/#grafting) are the riskiest. Implanted oysters and mussels are kept in a resting area for at least 2 weeks, a critical period for deaths and for the oyster rejecting its [nucleus](https://learnaboutpearls.com/glossary/#bead), then returned to calm water. [1] The pearl starts quickly after that. In the black-lipped pearl oyster, the [graft](https://learnaboutpearls.com/glossary/#graft) grows into a [pearl sac](https://learnaboutpearls.com/glossary/#pearl-sac) that covers the bead within 14 days, and the first [nacre](https://learnaboutpearls.com/glossary/#nacre) appears about 32 days after grafting. [1] In _[Pinctada maxima](https://learnaboutpearls.com/glossary/#pinctada-maxima)_, the South Sea oyster, nacre first forms on the bead about 45 days after the operation. [1] ## How long each type of pearl takes Saltwater oysters generally stay in the water for another 1 to 2 years after the operation before harvest, and freshwater culture usually takes 1 to 5 years. [1] The table gives each type’s range from the Learn About Pearls dataset, and the notes below explain where the numbers come from. | Feature | Akoya cultured pearl | Tahitian cultured pearl | South Sea cultured pearl | Freshwater cultured pearl | | ------------ | -------------------------------------------------- | ----------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------- | | Growing time | 6–36 months (typically 10 to 14 months) [2, 3, 7] | 18–24 months [4, 7] | 1–3 years (two to three years in Australia and the Philippines) [5, 7] | 1–5 years (depending on the culture method and mussel) [1, 8, 9] | - **Akoya.** GIA says Akoya oysters are typically left in the water for 10 to 14 months. [2] Japan’s Fisheries Agency gives a main culture of half a year to a year and a half, and notes that some pearls are harvested in under six months. [3] CIBJO adds that many Akoya are cultured within a year, while some grow for two to three years. [7] - **Tahitian.** [Tahitian cultured pearls](https://learnaboutpearls.com/glossary/#tahitian-cultured-pearl) are harvested after about 18 to 24 months, [4] and CIBJO counts one [bead-cultured pearl](https://learnaboutpearls.com/glossary/#beaded-cultured-pearl) per oyster every two years. [7] - **South Sea.** GIA says _P. maxima_ generally needs at least two years. [5] CIBJO gives two to three years in Australia and the Philippines, and one to two years in Indonesia, Myanmar and Vietnam. [7] Western Australia’s fisheries department says up to two years. [10] - **Freshwater.** Culture usually takes 1 to 5 years, depending on the method and the mussel. [1] In 2007, GIA’s journal described Chinese farmers waiting three to five years before harvest. [9] ## Second and later pearls Some oysters grow more than one pearl, one after another. After a harvest, an oyster that produced a high-quality [South Sea pearl](https://learnaboutpearls.com/glossary/#south-sea-cultured-pearl) is often given a new, larger bead and returned to the water for another 2 to 3 years. [1] One oyster can produce up to four pearls this way, and the black-lipped oyster’s second-graft pearls have been found to improve in size and shape. [1] In Western Australia, good oysters may be seeded several times, each pearl larger than the one before. [10] ## Why growing time matters Time builds nacre. [Nacre thickness](https://learnaboutpearls.com/glossary/#nacre-thickness) is closely related to the culturing period, and it can affect a bead-cultured pearl’s color, [luster](https://learnaboutpearls.com/glossary/#luster) and durability. [11] GIA puts the large size and thick nacre of South Sea cultured pearls down to their long growth period. [12] Short cultures have caused trouble before. In the 1990s, when some producers harvested Akoya as little as six months after implanting the bead, complaints surfaced, largely in Japan, of nacre peeling from pearls with coatings under 0.2 mm. [6] Longer culture can also mean larger pearls. In 2001, GIA’s journal described Chinese growers who grafted younger mussels and grew the pearls for four to six years, longer than usual, and so produced commercial quantities of pearls larger than 8 mm. [8] And in 1954, the Kuri Bay farm in Western Australia used larger beads to harvest after only 18 months. [6] ## When pearls are harvested The season matters as well as the length. In winter, or whenever the water is relatively cold, nacre forms more slowly, giving a finer, smoother and more lustrous surface, so cold conditions are preferred for harvesting. [1] Akoya farmers prefer to harvest in winter for this reason. [2] ## Questions people ask ### Which pearls take the longest to grow? Freshwater pearls can take the longest. Their culture usually takes up to five years, and some growers have extended it to six. South Sea pearls generally need at least two years, while many Akoya are harvested within a year. [1, 5, 7, 8] ### Why are some pearls harvested so quickly? Some Akoya are harvested after less than six months. The cost of a short culture is thinner nacre. In the 1990s, very short Akoya harvests led to complaints of nacre peeling from pearls with coatings under 0.2 mm. [3, 6] ### Can one oyster grow more than one pearl? Yes, one after another. A good South Sea oyster can be given a new, larger bead after each harvest and grow another pearl over 2 to 3 more years, up to four pearls in all. A freshwater mussel grows many pearls at once. [1, 7] ### Does a longer growing time make a better pearl? It gives thicker nacre, which helps luster and durability, and can let the pearl grow larger. But quality also depends on the oyster's health and the water. A stressed oyster can produce a blemished pearl, and water temperature affects how fast nacre forms. [1, 8, 10, 11, 13] ## References 1. Changbo Zhu, Paul C. Southgate and Ting Li (2019). Production of Pearls. [Source](https://link.springer.com/chapter/10.1007/978-3-319-96776-9_5) · DOI [10.1007/978-3-319-96776-9_5](https://doi.org/10.1007/978-3-319-96776-9_5) · [Archived copy](https://web.archive.org/web/20240129152149/https://link.springer.com/chapter/10.1007/978-3-319-96776-9_5) 2. Areeya Manustrong (2018). Very Small Akoya Cultured Pearls. [Source](https://www.gia.edu/gems-gemology/spring-2018-gemnews-very-small-akoya-cultured-pearls) · [Archived copy](https://web.archive.org/web/20260508145843/https://www.gia.edu/gems-gemology/spring-2018-gemnews-very-small-akoya-cultured-pearls) 3. Fisheries Agency of Japan (水産庁) (2026). 真珠養殖をめぐる情勢について (On the situation of pearl culture). [Source](https://www.jfa.maff.go.jp/j/saibai/attach/pdf/shinju-60.pdf) · [Archived copy](https://web.archive.org/web/20261026000052/https://www.jfa.maff.go.jp/j/saibai/attach/pdf/shinju-60.pdf) 4. Oïhana Latchere and others (2018). Influence of water temperature and food on the last stages of cultured pearl mineralization from the black-lip pearl oyster Pinctada margaritifera. [Source](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0193863) · DOI [10.1371/journal.pone.0193863](https://doi.org/10.1371/journal.pone.0193863) · [Archived copy](https://web.archive.org/web/20260905233729/https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0193863) 5. Artitaya Homkrajae, Nanthaporn Nilpetploy, Areeya Manustrong, Nicholas Sturman, Kwanreun Lawanwong and Promlikit Kessrapong (2021). Internal Structures of Known Pinctada maxima Pearls: Cultured Pearls from Operated Marine Mollusks. [Source](https://www.gia.edu/gems-gemology/fall-2021-internal-structures-pinctada-maxima-pearls) · DOI [10.5741/GEMS.57.3.186](https://doi.org/10.5741/GEMS.57.3.186) · [Archived copy](https://web.archive.org/web/20260420034834/https://www.gia.edu/gems-gemology/fall-2021-internal-structures-pinctada-maxima-pearls) 6. Russell Shor (2007). From Single Source to Global Free Market: The Transformation of the Cultured Pearl Industry. [Source](https://www.gia.edu/doc/Fall-2007-Gems-Gemology-Cultured-Pearl-Industry.pdf) · DOI [10.5741/GEMS.43.3.200](https://doi.org/10.5741/GEMS.43.3.200) · [Archived copy](https://web.archive.org/web/20261025235723/https://www.gia.edu/doc/Fall-2007-Gems-Gemology-Cultured-Pearl-Industry.pdf) 7. 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) 8. Shigeru Akamatsu, Li Tajima Zansheng, Thomas M. Moses and Kenneth Scarratt (2001). The Current Status of Chinese Freshwater Cultured Pearls. [Source](https://www.gia.edu/gems-gemology/summer-2001-chinese-freshwater-cultured-pearls-akmatsu) · DOI [10.5741/GEMS.37.2.96](https://doi.org/10.5741/GEMS.37.2.96) · [Archived copy](https://web.archive.org/web/20260814013828/https://www.gia.edu/gems-gemology/summer-2001-chinese-freshwater-cultured-pearls-akmatsu) 9. Doug Fiske and Jeremy Shepherd (2007). Continuity and Change in Chinese Freshwater Pearl Culture. [Source](https://www.gia.edu/dam/migrated-assets/docs/doc1/Continuity-and-Change-in-Chinese-Freshwater-Pearl-Culture.pdf) · DOI [10.5741/GEMS.43.2.138](https://doi.org/10.5741/GEMS.43.2.138) · [Archived copy](https://web.archive.org/web/20261025235652/https://www.gia.edu/dam/migrated-assets/docs/doc1/Continuity-and-Change-in-Chinese-Freshwater-Pearl-Culture.pdf) 10. Department of Primary Industries and Regional Development, Government of Western Australia. Pearl oyster fishery in Western Australia. [Source](https://www.dpird.wa.gov.au/environment-and-sustainability/sustainable-fisheries/pearl-oyster-fishery-in-western-australia/) · [Archived copy](https://web.archive.org/web/20260419144450/https://www.dpird.wa.gov.au/environment-and-sustainability/sustainable-fisheries/pearl-oyster-fishery-in-western-australia/) 11. CIBJO, The World Jewellery Confederation, Pearl Commission (2026). The CIBJO Pearl Book (Pearl Blue Book) 2026. [Source](https://cibjo.org/wp-content/uploads/2026/10/Pearl-Blue-Book-2026-.pdf) · [Archived copy](https://web.archive.org/web/20261025235254/https://cibjo.org/wp-content/uploads/2026/10/Pearl-Blue-Book-2026-.pdf) 12. Gemological Institute of America (GIA), Gem Encyclopedia. Pearl Description. [Source](https://www.gia.edu/pearl-description) · [Archived copy](https://web.archive.org/web/20261017085317/https://www.gia.edu/pearl-description) 13. 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) **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 Long Does It Take to Grow a Pearl?_ Learn About Pearls. https://learnaboutpearls.com/farming/how-long-pearls-take-to-grow/ **MLA:** “How Long Does It Take to Grow a Pearl?” _Learn About Pearls_, Unique Pearl, November 4, 2026, learnaboutpearls.com/farming/how-long-pearls-take-to-grow/. **Chicago:** Learn About Pearls editors. “How Long Does It Take to Grow a Pearl?” Learn About Pearls. Unique Pearl. Last modified November 4, 2026. https://learnaboutpearls.com/farming/how-long-pearls-take-to-grow/. **BibTeX:** `@misc{lap-farming-how-long-pearls-take-to-grow, title = {How Long Does It Take to Grow a Pearl?}, author = {{Learn About Pearls editors}}, year = {2026}, howpublished = {\url{https://learnaboutpearls.com/farming/how-long-pearls-take-to-grow/}}, 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 - [How pearl farms work](https://learnaboutpearls.com/farming/how-pearl-farms-work/): The five stages of pearl farming, from choosing the oysters to processing the pearls. - [How pearls form](https://learnaboutpearls.com/basics/how-pearls-form/): How natural and cultured pearls grow inside a mollusk, layer by layer. - [Akoya pearls](https://learnaboutpearls.com/types/akoya-pearls/): The classic round, white saltwater cultured pearl, grown mostly in Japan.