The most valuable pearls occur spontaneously in the wild, but are extremely rare.Pearls are formed when an irritant, such as a bit of food, a grain of sand, or even a piece of the mollusk's mantle becomes trapped in the mollusk. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. A natural blister pearl forms naturally as a whole pearl within a pearl sac in the mantle (see natural cyst pearl). The most valuable pearls occur spontaneously in the wild, but are extremely rare.Get up to 60¢ per gallon back at Shell in Pearl (3191 US-80 East), MS! A pearl forms within a pearl sac in the mantle tissue and over time grows through the deposition of concentric rings of calcium carbonate. Buy with quick dispatch from the UK.The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries.
When polished they reveal natural mother of pearl below the surface.
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