Pearls are among the most timeless, classic and treasured of all gems. Throughout history, these noble gems have been associated with wisdom, wealth, purity, romance and mystery. It's hard to believe that such a luscious, beautiful gem comes from such humble origins. A natural pearl starts out as a grain of sand or microscopic worm that works its way into an oyster. To protect its soft body from this irritant, the oyster secretes a smooth, hard substance called nacre. Layer upon layer of nacre coats the foreign object and hardens, ultimately forming a pearl. In general, the thicker the nacre, the richer the "glow" of the pearl - which can greatly enhance its value.

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