NEW SOUTH WALES, AUSTRALIA—A 2,000-year-old natural marine pearl was discovered at the Brremangurey Rockshelter during excavations conducted by researchers from the University of Wollongong (UOW), the ...

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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, ...

Learn about how mollusks create these shiny gems and how that biological process could change as Earth’s waters warm Abigail Eisenstadt Smooth pearls in the shape of orbs and ovals are usually created ...