Emerald has been one of the precious stones since ancient times. According to legend, 6,000 years ago, there were people in Babylon who presented it to the statue of the goddess. In the ancient Chaldeans of the Persian Gulf, women especially love emerald jewelry. Ancient Egypt and the ancient Greeks thousands of years ago also liked to use emeralds for jewelry. Chinese people are also very fond of emeralds. The emperors of the Ming and Qing dynasties were especially emeralds. The Emperor of the Ming Dynasty regarded it as precious as the golden-green cat's eye, and said that "the ceremony requires cat eyes and emeralds." Ming Wanli Emperor's jade belt is set with a large emerald, which is now in the Ming Tombs of the Ming Tombs Museum. In addition to the large number of pearls and other precious stones, the golden silk casket covered by the Empress Dowager Cixi has two emeralds weighing about 5 yuan each. Emerald is the birthstone of May. It symbolizes luck and happiness. Wearing it will bring peace to life. It is also a memorial stone for the 55th anniversary of marriage. Emerald is a very old gem that has been used as jewelry in ancient Egypt. price The price of emerald is based on the different parameters of the gemstone to determine his price. Generally, if you wear it yourself, the price ranges from 5000-3W. Color characteristics The color of emerald is very attractive. Some people describe it with spinach green, green onion, and green bud green, but they can't accurately express its color. It has a yellowish green color, and it seems to have a little blue. Even the spectrum seems to be missing the dot wavelength. Indeed, no natural color makes the eyes so comfortable. Whenever you look at the verdant lawns and leaves, the pleasing sensation is imaginable, but it is inferior to the emerald color. It is one of the gemstones that can never be seen. Whether it's cloudy or sunny, whether it's an artificial light source or a natural light source, it always glows softly and radiantly. This is the king of green gems - the charm of emeralds. Emerald is a gem-quality green beryl. The green color should reach medium to reach a rich green tone, that is, the concentration of the color should be relatively saturated. Light green is often referred to as green beryl. The beryl is produced by nature and its main component is Be3Al2[Si6O18], which has a hexagonal symmetrical aluminosilicate mineral. Emerald is formed due to the proper amount of Cr2O3 (0.15~0.6%). It is the most outstanding member of the beryl family. The material is a high-grade gem. Its color source is: traces of chromium oxide make it appear crystal clear green. Physical and chemical ingredients Citing the Asian Gemological Association (GIG) study: Emerald is a bismuth-containing silicate with a molecular formula of Be3Al2[Si6O18], which is one of the most noble members of the beryl family. It belongs to the hexagonal system. The crystal form is a hexagonal column, a hexagonal double cone, and most of them are rectangular columns. The aggregate is granular, massive, and the like. Emerald green, glass luster, transparent to translucent. The refractive index is 1.564-1.602, the birefringence is 0.005-0.009, and the chromaticity is not obvious. Heterogeneous. Hardness 7.5, density 2.63-2.90 g / cm3. The cleavage is not complete, the shell-like fracture. Brittle. Under X-rays, the emerald emits a weak, pure red fluorescence. Emeralds and diamonds, rubies, sapphires and the world's four famous gems. Its chemical name is: yttrium aluminum silicate Be3AL2Si6O18) belongs to the beryl family. It is crystal clear green with a trace of "chromium". Its physical properties: (1) hardness: 7.5 ~ 8. (2) Density: 2.67 to 2.78 g/cm3. (3) Refractive index: 1.56 to 1.60. (4) Birefringence: 0.004 to 0.010. (5) Gloss: Glass luster. Pillowcases By Envelope Closure White Pillowcases,Pure Silk Pillowcase,100 Mulberry Silk Pillowcase,Pillowcases By Envelope Closure YUNFREESILK , https://www.yunfreesilk.com