Throwing Beads with a height of about 30 cm, so you can make sure of natural stone. The true jewel bounce a few times as the ball from tennis. But a fake - a couple of times and stop. This is due to the internal structure of the material features.
The most effective way to determine a fake - try the pearl on the tooth. If the material is natural, something like a stone rests on the surface of the tooth and leave a taste in the mouth of sea sand. The fact that the real pearl nacre consists of flakes, which are layered on top of each other during its growth in the clam shell-pearl.
In order to verify the authenticity of the jewelry can be a little sharp knife to scratch the beads. Such verification will not hurt the stone. Scratch that left the knife blade will quickly and just as quickly disappear if on the surface pat fingertip. The disappearance of the damage is a clear proof of the authenticity of pearls. During the experiment with the surface may peel off a layer of fake pearl paint, and the scratch disappears while smoothing finger.
Particularly meticulous connoisseurs of precious stones can be recommended to explore the edge of the drilled hole under a magnifying glass beads large increase. If it is an imitation, it is on a section of the hole you can see the structure of the stone.
In addition to the simulation, there is a so-called blister pearls. This cultured stones, they produced a somewhat different way and are sold very cheaply. In order to obtain a blister to the inner wall of the core is attached clam clay. Then, after waiting for when it will be covered with a single layer of nacre, it is removed by drilling a hole in the sink. In this pearl dies. Then cut out the core, replacing it with pearl hemisphere and halves glued together. In such beads usually traces gluing diameter. If such pearls sell for natural - it's a scam.