Philippine Association of Pearl Producers and Exporters.


color most often associated with pearls produced by the black-lip (Pinctada margaritifera) mollusk; it’s a dark green gray to blue gray with rosé to purple overtones


drop pearl shaped like a pear


nacreous or non-nacreous calcareous concretion formed as a progressive secretion naturally and circumstantially within a mollusk

Pearl of Allah

natural pearl from the giant clam (Tridacna gigas), it is the world’s largest non-nacreous calcareous concretion, measuring 23 cm by 14 cm by 14 cm and weighing 6.37 kilograms; the pearl was found off Brooke’s Point, Palawan Island, in the Philippines on May 7, 1934

pearl powder

ground nacre, often used in medicines and cosmetics

pearl sac

grown from epithelial cells to envelop an intruder or a bead nucleus, it deposits nacre and forms a natural or cultured pearl

pearl sieves

used to sort cultured pearls by size


outer layer of a bivalve mollusk shell, formed of conchiolin


mollusk genus in the family Pteriidae. It’s the most important genus in saltwater cultured pearl production

Pinctada margaritifera

the black-lip pearl mollusk; the variety Pinctada margaritifera cumingi used to produce Tahitian and Cook Islands cultured pearls

Pinctada maxima

the silver-lip or gold-lip pearl mollusk; used to produce South Sea cultured pearls


oblong pearl shaped like a potato

princess necklace

pearl necklace measuring 17 to 19 inches (43 to 48 cm)

Pteria penguin

mollusk originally used to produce assembled cultured blister pearls

Pteria sterna

rainbow-lip mollusk used to culture pearls in the Gulf of California (Sea of Cortez)