People have been fascinated by a variety of colors of pearls, such as white, gold, silver, pink, red, black, blue, gray. But at the same time,they are also curious about which color is the most precious one.
White with red rose has been regarded as the best one and blue-black with metallic luster as particularly good. You had better caution when the color is clear black or gray, it may be dyed . Natural Black Pearl is not a pure black, but slightly rainbow-like flash of deep blue black, or black with a bronze color. While, dyed pearl is gray-black or black with dull and poor luster. Wiping the dyed pearl with a cloth, which is dipped in 5% dilute nitric acid, you would find a black mark on the cloth.
First, every pearl has its size and shape from the appearance
Second,under the light, artificial pearls have no luster and genuine pearls show soft light.
Third, pearl powder proceeds from the friction between the two pearls. And the surface will as bright as before even though the powder is wiped off.
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