Although pearls do not have international certification standards, the quality of pearls can be assessed in six ways: color, shape, gloss, nacre, surface and size. colour There are many colors of pearls, almost as rich as rainbows. When assessing the quality and value of a pearl, the color is mainly viewed in two ways: the color of the bead and the overall hue. The color of the beads is the most important base color for the pearls. It can be warm (purple or green) or cool (red-purple or yellow-green). The overall hue is the color of the pearl surface, which can be seen at different light angles. The overall color distribution of premium pearls is very uniform. shape Unlike the general public, pearls are not all round. Pearls come in a variety of shapes, including round, semi-circular, pear-shaped, oblate, irregular, and the like. Irregularly shaped pearls are completely asymmetrical shapes. In general, round pearls are considered to be the highest quality pearls and are of higher value. Nacre The nacre, also known as the mother-of-pearl, refers to the pearlescent substance secreted by the shell when the foreign matter enters the pearl shell, and the foreign matter is wrapped to relieve the discomfort. This process eventually leads to the formation of the pearl. This substance is also visible in the inner layer of the shell. The nacre is mainly composed of calcium carbonate and baker hard protein. In general, the thicker the pearl of the pearl, the better the quality of the pearl. luster The luster of a pearl refers to the light reflecting ability of a pearl, and is generally called a halo. The high-quality pearls are bright and have a clear reflection of light. When viewing a quality pearl, you can even see your own reflection. If the surface of the pearl looks dull, as if it is dusty, then the quality of the pearl is very common. The darker the luster of the pearl, the lower the quality of the pearl. surface As everyone knows, no pearl is absolutely "perfect", and the best quality pearls are just close to perfection, clean and flawless. When reviewing a pearl, you should carefully check for flaws, pits, cracks, fading or other defects. The surface of the pearl affects the reflective properties of the pearl, so any bumps will reduce its value. size The size of the pearl is calculated in millimeters. If the pearl is not a perfect sphere, you need to measure its minimum diameter. Need to remember that the size of the pearl alone does not determine the value of the pearl. White Running Shoes,Sport Shoes,Black Sports Shoes,Stability Running Shoes Huaying Shoes Co. Ltd , https://www.hya3shoes.com