Wikipedia: Oyster – Information about salt-water bivalve molluscs – types, anatomy, etc..
Pearl – Information about the gemstone, pearl. Etymology, definition, physical properties, fresh and saltwater pearls, creation and much more.

American Pearl: A Brief History of Pearls: How Pearls are Harvested – Article about harvesting pearls, early history of pearl harvesting, and caring for oysters before harvest.

How Stuff Works: Animals: How do oysters make pearls? – Article talks about the natural production of pearls within the oyster’s anatomy and how cultured pearls are created.

Oceana: American Oyster – Describes what an oyster is, how it grows/reproduces, and about depleted population due to over-fishing.

Metal Floss – 15 Shucking Amazing Facts About Oysters – This list offers some interesting facts about oysters, such as their ability to filter water, hold back fierce waves, their nutritional value, depletion and restoration projects, and more.

Ideo: Columbia.edu: Commonly seen organisms in Oyster Gardens – PDF: Information about creating an oyster garden – includes predators and reef associates. Includes pictures.

Original Oyster House – 10 Oyster Facts You Didn’t Know – Info about oyster gender, oyster beds, human consumption, species, nutrition information, and more.

A-Z Animals: Oyster – Oyster facts, where they can be found, lifespan, color, food, predators, habitat and more.

Nat Geo Sites: Oysters – About oysters: As a food, habitat and range, shells, behavior, and threats to survival.

Rondale’s Organic Life: 6 Surprising Things You Should Know About Eating Oysters – Farmed oysters vs wild and the best time to eat them.

YouTube: Oysters & Pearls Playlist –  Videos include: How pearls are harvested, how pearls are formed, and how to shuck and eat an oyster.
Here’s one of the videos that can be found in the list…