Oysters are the main producers of pearls, but clams and mussels can also create them. Pearls form when oysters secrete layers of nacre around irritants. There are natural and cultured pearls, with ...
Pearls begin as irritants within oysters, which respond by slowly covering the foreign object with layers of nacre. This controlled biological process, influenced by environmental factors and diet, ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results