Pearl

Tap to open or close the oyster. Hands-on: lift the pearl out, then put it back.

A pearl is a gem made by a living animal. When an irritant, usually a scrap of the animal's own tissue or a bead put in by a pearl farmer, ends up inside an oyster or mussel, the animal coats it with layer after layer of nacre, or mother-of-pearl, the same shiny stuff that lines its shell. The thin layers give a pearl its soft glow, called luster.

This oyster starts open, with its pearl inside. Tap it to close the shell; tap again to open it. A pearl can take years to grow, and most pearls sold today are grown on pearl farms. With ✋ Hands-on on, pry the lid open or shut by hand, lift the pearl out and roll it about, then bring it back near its place in the shell and it settles in.

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