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Crystal is very pure and transparent which is loved by many people; there are lots of priceless treasures, crystal products in the jewelry market as well as many fake crystals. It is a very easy to identify it, if you have detection instrument. However...

Except for pure white pearl, pearls have many other colors such as black, milk white, bright yellow, bright rose, and pink, among them, the white peal with little rose color and dark blue pearl with mental luster are considered as the best. Black pearl is...