from the GNU version of the Collaborative International Dictionary of English
- n. a pearl grown by a pearl oyster into which a round pellet has been placed, to serve as the seed for more predictable growth of the pearl. The pellet is usually made from mother-of-pearl, and additional layers of nacre are deposited onto the seed by the oyster. Such pearls, being more easily obtained than natural pearls from wild oysters, are less expensive.
Sorry, no etymologies found.