When debris gets trapped in between the shells ... white to black — including blue, green, orange, pink, and yellow. The main factor that determines the color of pearls is the shade of the ...

Uma Thurman's dress had over 3,000 white ... shell of a mollusk like an oyster or a mussel. To protect itself from the invader, the mollusk starts to coat the debris with nacre, or mother-of-pearl ...

akoya oyster populations should return to health, probably by the year 2002. Thinning may solve the problem, Müller says, because lower shell density usually results in a higher quality pearl.

The oyster or mussel slowly secretes layers of aragonite and conchiolin, materials that also make up its shell. This creates a material called nacre, also known as mother-of-pearl, which encases the ...

An ambitious project launched by an NGO called The Nature Conservancy aims to recover hundreds of oyster shells in order to ... the South China Sea and the Pearl River Delta, Hong Kong has long ...