How to choose pearls, which brand of pearls is good

The grade and quality of pearls are mainly evaluated from six quality factors, such as color, size, shape, finish and bead thickness (nucleated pearls). Let's learn how to distinguish between good and bad pearls. The color of the pearl is divided into white, red, yellow, black and other 5 series, of which white, red, purple 3 color system is the most important color system, each series includes a variety of body colors. Such as: white series: pure white, milk white, silver white, porcelain white, etc.; Red series: pink, light rose, lavender red, etc. Yellow series: light yellow, beige, golden yellow, orange yellow, etc. Black series: black, blue black, gray black, brown black, purple black, brown black, iron gray, etc. Others: purple, brown, cyan, blue, brown, fuchsia, green yellow, light blue, green, bronze, etc. Pearls may have companion colors such as white, pink, rose, silver or green. Pearls may have halo, halo is divided into strong, obvious, and general halo. Color description: body color is the main description, accompanied by color and halo description. Color, depending on personal preference, has no effect on the quality of the pearl. Second: the size is round, round, nearly round pearls to the smallest diameter to express, other shapes of cultured pearls to the largest size multiplied by the smallest size, batch loose beads can be expressed by the aperture range of the pearl screen. Measure the size of the pearl (according to the calculation, the roundness of the pearl is perfect, round or nearly round). The size of pearl is one of the important factors affecting the quality of pearl. In ancient China, there is a saying of "seven points pearls and eight treasures", which means that seven points (mm) are pearls, and eight points (mm) are precious. The larger the size, the more expensive the relative price. The shape of the pearl can be divided into: round, round, nearly round, oval, flat, shaped. The shape of pearl is one of the most important factors affecting the quality of pearl. In short, the rounder, the higher the price. From round pearls to shaped pearls, the price decline is a jump, but the price change of round, round and nearly round and water drop shape is gradual, and the price difference between each level is 15% to 20%. Of course, there is also a higher price for regular pearls, especially those that are easier to Mosaic and use, such as teardrop (pear), oval, button shaped pearls. Fourth: grade pearl is a kind of organic gemstone with special pearls, the special beauty of pearls is produced by its unique pearls, so the pearl is the most characteristic element of pearl quality (note that there is no one, is the most important! In popular terms, pearls wear on your neck, even if there are defects, others because you stand a little distance, it is not easy to find, and pearls are in a far place can be seen). Especially cultured pearls, other elements such as size and shape can be artificially or partly artificially controlled, but also become a unique indicator. The strength of the pearl is mainly related to the thickness of the pearl layer, the order of aragonite or calcite in the pearl layer, the growth of the pearl, and the trace elements in the water, so the light selection of the pearl is actually an external indicator of the thickness of the pearl layer, and also reflects the growth health of the mother of pearl. Generally speaking, the growth time of the pearl is moderate (generally 2 to 4 years), the water environment of the formation of the pearl is good, and the key health of the pearl shell is good, the stronger the pearl is; On the contrary, the growth time of the pearl is too short or the health condition of the pearl shell is poor, the quantity and quality of the pearl spoon secreted by the pearl shell are poor, and the pearl is poor. Fifth: finish level Finish, also known as skin or leather, clarity, defects, it refers to the density of the pearl surface structure, delicate, smooth degree, or the obvious degree of surface defects. The common defects on the surface of pearls include bumps, lines, cracks, pits, black spots, notches, needle tips and peeling of the pearl layer, among which the breakage and peeling have the most serious impact on the quality of pearls. The number and distribution of such defects determine the clarity or quality of the pearl, and also directly affect the quality and value of the pearl. Sometimes they also directly affect the service life of the pearl and the possibility of pearl post-treatment. The finish of pearl is one of the important factors affecting the quality of pearl. Sixth: bead thickness level (this is mainly for nucleated cultured pearls, generally freshwater pearls are nucle-free cultured, there is no this level) The current detection methods include X-ray phase method, OCT optical coherence tomography bead thickness detection method and direct measurement method