Young Black Haired Girl With Long Hair And Blue Eyes Reveals Her Black Pearl Necklace And Skirt On White Bed Sheets

Somewhat similar gastropod pearls, this time more orange in hue, are (again very rarely) found in the horse conch Pleuroploca gigantea.
The largest pearl known was found in the Philippines in 1934 and is known as the pearl of Lao Tzu. It is a naturally-occurring, non-nacreous, calcareous concretion (pearl) from a giant clam. Because it did not grow in a pearl oyster it is not pearly; instead the surface is glossy like porcelain. Other pearls from giant clams are known to exist, but this is a particularly large one, weighing 14 lb (6.4 kg).
The history of pearl hunting and pearl farming