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PEARL
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Nature of Material: Cultured pearls are organic gems grown in certain salt water and fresh water mollusks where man has inserted a nucleus (usually a shell bead or a piece of mantle tissue) as an irritant to cause the formation of a layer or layers of nacre, which has essentially the same structure and composition as the nacre of natural pearls.

Appearance: translucent to opaque virtually any body color, but usually white or light yellow (called cream); also modified by additional colors called overtones, which are typically pink (called rose), green, or blue.

Phenomena: orient - an iridescent effect, usually faint
 
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