The Field Museum
Field Museum: Pearls Exhibition
Highlights from a past Field Museum exhibition on pearls. You'll learn how pearls are made and how scientists and pearl farmers are working to conserve them.
Jewelry Central
Jewelry Central: Pearls
This commercial site gives general information on pearls, including their physical properties and where they are found.
Wikimedia
Wikipedia: Pearl
This site from Wikipedia provides a general overview of the pearl, a hard, rounded secretion formed inside the shell of mollusks.
Other
Gillett's Jewellers: Pearl Information
Pearl characteristics, differences between a cultured pearl and a shell-based pearl, and freshwater pearls are some of the topics featured on this page.