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Pearls of different colors are often associated with their place of origin; Persian Gulf pearls are creamy white; Sri Lankan are a paler white; Australian are white or silvery; Tahitian and Mexican are gray-fl to reddish-brown; West Indies are rose red with wavy lines; "Indian" (actually Sri Lankan) may be a faint rose color.
In modern cultured pearls the nucleus, which is a bead composed of freshwaterclamshell wrapped with a strip of the mollusksmantle, is placed within the mantle or gonad of the bivalve, away from the shell, allowing it to grow freely.
Dying cultured white pearls to pink is also a practice that has seen widespread use, but can be detected in drilled pearls by examining the drill hole to look for an uneven concentration of color.
Pearl is valued as a gemstone and is cultivated or harvested for jewellery.
Freshwaterpearls are characterized by the reflection of rainbow colors in the luster.
The value of the pearls in jewelry is determined by a combination of the luster, color, size, lack of surface flaw and symmetry that are appropriate for the type of pearl under consideration.