Among marine cultured pearls, black pearls are much more expensive than white pearls, which are rare and rare. Located in French Polynesia in the middle of the Pacific Ocean, the use of black scallops to breed seawater black pearls has been a huge success. Since the beginning of the 1970s, the output has increased year by year. By 1988, about 447 kg of black pearls were produced in marine aquaculture, and the income was as high as 22.87 million US dollars, and the average price per pearl was about 51 US dollars. French Polynesia's marine cultured black pearls are able to obtain such high prices because some of them have very good quality pearls. They are characterized by large size, large size of 20.8mm, and excellent gloss, showing a deep blue photo. Hue. Glittering rainbow-like colored metallic luster. This high quality marine cultured black pearl can get a very high price. For example, in October 1988, a string of sea pearls (53 capsules) and gray pearls (59 vs.) were sold. The pearls were 12-15 mm in diameter and sold for $649,000, except for the necklace. The value of an emerald, the average price per pearl is more than $4,000. Since the production of black pearls is scarce and precious, it is often sold at a high price after natural pearl dyeing. The method of blackening is to soak the pearls in a silver nitrate solution and then place them under strong light or radiation to blacken them. Some also dye the bead nucleus first, then implant it into the pearl shell, and release the pigment while growing. The cultured black pearl and the dyed black pearl have the same appearance, and the nacre is completely opaque, so the naked eye identification is also tricky, and can be distinguished by some methods, such as observation method, nitric acid method, powder method, ultraviolet fluorescence method, X Radiography, cross filter, infrared photography. As long as you master the above identification methods, other types of pearl identification on the market can be bypassed. Satin Ribbon Fascinators,Popular Millinery Hat,Dress Headwear Hats,Satin Ribbon Headwear SHAOXING YONGJING FASHION HATS & ACCESSORY CO.,LTD. , https://www.yongjingchurchhat.com
October 21, 2020