The surface of the natural pearls are very smooth, because in the sink each layer of the pearl is growing unevenly. While checking on the tooth while trying to bite a bead with faux pearls tooth slipping. It's too slippery and smooth. The natural surface is somewhat rough, tooth clings to her.
Natural pearls differ from one another in size, shape and color. They grow inside mother of pearl shells in natural conditions, therefore, may not be exactly the same. Artificial beads are totally different from one another, as are produced in factories.
You can check the naturalness of friction. Take two pearls, RUB them together with little effort. Between the authentic appear fine dust. After wetting traces of friction will remain.
You can use special jewelry scanner. It will have to go to the lab or jewelry shop. Device illumine bead. In kultivirovaniya pearls clear rounded nucleus. In the natural contours of the nuclei are blurred and do not have a spherical shape. The simulation is observed on the surface of a thin very clear layer. The scanner will be able to determine the origin of pearls in the sea a greater content of manganese than river.
If you bought expensive jewelry, it is possible to check authenticity jewelry using nail files. Select a bead near the clasp and RUB it with a nail file. With dyed mother of pearl imitation pearls will fade, top coat, and you will see the basis.