User Tools

    To create and edit articles, please register and log-in

Main Menu : categories & index etc.

Main menu
Click categories to expand

A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.

Other categories



Also see

Importance Ratings
Curator's rationale
AI Policy

Twitter feed 𝕏

Feeds + s.e.o. etc.
rss / xml feed
sitemap file
A-Z listing (archived)

Indexed under : Life Sciences / Zoology

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Pearl formation

Pearls are the only 'gems' produced by a living organism. Their formation process (either by natural means or through human intervention) is a response to an injury in an oyster's 'mantle' tissue, such as an intrusion by a foreign body, e.g. a sand grain etc.

The exact mechanisms for the glossy pearl formation are unclear.

Nature's ability to generate so amazingly complex structures like a pearl is impressive and still partially unknown. […] Such a challenge will strongly encourage the community to continue to develop approaches and knowledge to decipher the biophysical and molecular details of biomineralization processes.“

”[…] our fundamental understanding of nacre formation remains limited. Few studies are available that explain the pearl mineralization process as well as the formation of defects […]“

Source : Yes, it turns: experimental evidence of pearl rotation during its formation Open AccessRoyal Society, Open Science

The 2105 study from Université de la Polynésie Française experimentally demonstrated, for the first time, that pearls rotate inside the oyster during their formation - perhaps contributing to their rounded form.

Note: As the quote above explains, the formation of nacre - the material which forms not only pearls but also the shells of marine molluscs in general - has not been fully explained.

    Please share this page to help promote Wikenigma !

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.

If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !

Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.

( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)

Automatic Translation

You are currently viewing an auto-translated version of Wikenigma

Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.

Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.

Show another (random) article

Further resources :