pearl

A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusc. Just like the shell of a clam, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries, and because of this, the word pearl has become a metaphor for something very rare, fine, admirable, and valuable.

For more information about pearl check the Wikipedia article here

ZME Science posts about pearl

2000 year old gold earring found

Mon, Nov 10, 2008

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The Israel Antiquities Authority said that archaeologists found a 2,000-year-old gold earring next to the walls of the ancient city, under what was a parking lot. This is not the first amazingly well preserved piece of jewelry found in Israel, but many jewish works of art are often found in other places (such as the [...]

emerald, gold, pearl

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