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Generally speaking, pearl’s color are not transparent, the prevailing color is white, cream, yellow, pink, silver and black. There maybe a little of secondary color on the pearl, in other words, it is the color through reflecting. For example: A pearl looks like a white possibly, but when we view the surface of the pearl from a very close distance, we will see a refraction of pink.
The pearl should produce a kind of light which is so intensely and deep thick, we called it “luster”, the form is caused by the light reflecting on the surface of pearl jewelry  which is made of many calcium carbonate;
This material named nacre layer. When you choose the pearl, you need to know the bigger one has more nacre layers, and it should be more brightly. Compare a 5 millimeters pearl which is produced from fresh water with a 10 millimeters pearl which is produced from southern coastal, It is apparently different on the nacre layer’s number .Because the size is dissimilar, the pearl color is dissimilar obviously also.