Most pearl experts can easily identify imitation pearls and genuine pearls by sight alone. But it is difficult for the average consumer to distinguish a genuine pearl from a good imitation pearl by sight. An easy way to tell the difference between genuine pearl and imitation pearl is the “tooth” test. Rub pearls slowly across the front teeth, if feel smooth and no any resistance, it is imitation pearl, if feel gritty or sandy, it is genuine pearl. This “grittiness” is from the crystalline structure of nacre that forms genuine pearls. At the same time, because the pearl is the creation of nature, it is very rare to have all the pearls of strand look identical. It is also very rare to find the whole strand pearls are flawless. Most pearls does not have pure body color. They always come with some kind of overtone color or orient.