Pearl
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A pearl is a hard, glistening object produced within the soft tissue of a living shelled mollusk. Just like the shell of a mollusk, a pearl is composed of calcium carbonate in minute crystalline form,
Georgian seed pearl gold ring
A black pearl and a shell of the black-lipped pearl oyster. The iridescent colors originate from nacre layers.
Electron microscopy image of a fractured surface of nacre
Baroque pearl
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Baroque pearls are pearls with an irregular, non-spherical shape. Shapes can range from minor aberrations to distinctly ovoid, curved, pinched, or lumpy shapes. Most cultured freshwater pearls are bar
Pearl
…form, which is deposited in concentric layers. More commercially valuable pearls are perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearls…
Spheroid baroque pearls