Pearl loose beads wholesale Identification of natural black pearl and black pearl differential staining

In the mariculture, black pearl black butterflies PayPal is the natural product. The black pearl production scarce, precious comparison. People often dyed black pearls to sell. The other method is to soak in the color of pearls with silver nitrate solution, dried out after that dyed Huihei or pure black. Natural black pearl is not pure black, but with a slight rainbow-like flash of dark blue or black with a bronze hue. Dyeing is not pure black, uniform color, luster poor. Dip by 5% nitric acid Mianqian cleans pearls, not Diaose natural pearls, pearls and stained black stains left behind. Natural pearls delicate surface smooth, stained black pearl beads surface layer are often corrosion, corrosion can be seen traces of minor crease and natural spots or powder. Natural pearls and cultured pearls identification of natural pearls delicate texture of uniform thickness pearls, sustained grave-like translucent, shiny strong. Cultured Pearls of pearls and thin, better transparency, gloss than natural pearls, and the shape of natural pearls and more irregular, smaller diameter, and a sustained round cultured pearls, large head, often pit the surface, loose texture. To strong light, slowly rotating pearls, in the proper position to see cultured pearl beads nuclear flash. Two 360-degree flash general, the beads can also be seen in light and shade-and parallel stripes.

Agate stone natural color, but also dyeing processing. Major natural color with red, amber and white. Among them, in red for the best. Available in the market blue, purple agate jewelry is not characteristic of the post-processing is contracted, there will be several years after bleaching. After staining the natural variegated agate, it is not easy directly processed into jewelry. How to Identify real agate jewelry? Can be divided into three aspects to identify. ⑴ transparency: True agate transparency than synthetic, and a little chaotic, and some may see natural waterline or "clouds", and synthetic agate transparency, and as transparent as glass beads. ⑵ Weight: True agate jewelry than synthetic agate jewelry heavier. ⑶ Temperature: Dongnuanjialiang really agate, and artificial agate with a temperature of the outside world changes, it also changes days of heat, cold day cooling it. How to Select agate jewelry? First according to choose their own favorite color. Red agate most precious jewelry, such as the need to pay attention to the election agate necklace beads each of them to the same color, not variegated, with beads the size should be appropriate, we must pay attention to finish better. Then, against the necklace to see if vertical, whether each beads are in a vertical line, if there necklace bending This shows some beads Wener partial, processing rough.