1, the black pearl of the superior family-a legend that has been circulated for 15 centuries, has turned the black pearl into a sad tear buried deep in the sea, and the rich sad color still cannot hide the unique charm of the black pearl. There are all kinds of colorful colors on the natural black tone, and the most appreciated are the rainbow colors such as peacock green, deep purple and navy blue. Yi Shi Sea Pearl-the famous Japanese Yi Shi Sea Pearl, also known as Akoya Pearl, is a top-class pearl. This kind of pearl is mostly round or nearly round, which is an ideal material for beaded necklaces and bracelets. Nanyang Pearl-Nanhai Pearl is the most important. Although the shell is white, Nanyang pearls can have many kinds of gradient colors. The gradient color can change from warm white to pink to silver, and finally it is really golden luster. The bigger the pearl, the more precious it is. According to the old saying in China that "seven pearls are eight treasures", pearls weighing eight (round pearls with a diameter of about 9 mm according to their size) are "treasures". It can be seen that the size and value of pearls are closely related, and the bigger the pearl, the more valuable it is. The bigger the shell, the bigger the pearls that can be produced, so there are many big pearls in the seawater beads. 3, the most beautiful round Generally speaking, round pearls are recognized as the most beautiful pearls, which everyone is eager for. At the same time, water-drop pearls are very rare and attractive. The pursuit of round pearls does not mean that other shapes do not have their unique charm and value. 4. Smooth and flawless is the pearl surface quality of excellent pearls, including flaws and smoothness. The defects of pearls refer to the internal and external defects that lead to the unsmooth and unsightly surface of pearls. Smoothness refers to the total degree of pearl defects. 5. If the matching degree of the whole multi-bead is based on the quality appraisal, it is rated for a single pearl such as a ring and a pendant, but the jewelry composed of multiple pearls must be regarded as the pearl of the whole jewelry. Make a unified evaluation. For the whole pearl jewelry, it is also necessary to distinguish the grades according to the luster, smoothness, shape, color and size of the pearls, and it is required that the pearls of the whole jewelry are uniform. For more details, please click on the picture. In ancient Persian mythology, pearls were the tears of the gods. The ancient Greeks and Romans believed that pearls were a gift from heaven. If a woman can only have one gem, it must be a pearl.