Gold and green treasures ｜ American giant gold and green treasures are priceless.

　　1. What is a golden emerald? Chrysoberyl, also known as chrysoberyl, is a rare gem, and it is very precious if it can be cut into large particles with good color clarity. Among the emeralds, the golden-green cat's eye is well known to the public. It has become one of the most beautiful gems in nature because of its silky luster and sharp eyeliner. There is a relatively large collection prospect. The emerald covered with gold coat but not gold is named after its unique yellow-green to gold-green appearance! Let's take a look at the golden emerald, a surprisingly beautiful gem.

　　Emerald is not famous in China, but it is one of the most popular gems abroad, especially in Europe and America, where locals are eager for it. Frankly speaking, foreigners' enthusiasm for emeralds is no less than that of Chinese people for jadeite. Because emeralds, like jadeite, have rich cultural heritage and a long history of jewelry.

　　In modern times, the American Museum of Natural History also harvested a giant golden emerald, weighing about 47.8 carats, and it also has a cat's eye effect, which is priceless. Surprisingly, its beautiful "cat's eye" can flash the light of wisdom in the dark, which has made the variety "opal" famous since then. In the early 19th century, there was a gold emerald named "Hope" in the British Natural Museum, which weighed about 40 carats. The gem was carved into a polyhedron, attracting treasure fans from all over the world to pay tribute to its prosperous beauty.

　　2. What are the varieties of Jinlubao? Chrysoberyl belongs to one of the five precious gems, belongs to Chrysoberyl family in mineralogy, and its common colors are yellow, yellow-green, brown, brownish yellow, etc. Chrysoberyl is famous for its special optical effects, which can be divided into Chrysoberyl, Cat's Eye, Metamorphic Stone Cat's Eye and other varieties.

　　(1) gold emerald, refers to the gold emerald without any special optical effect, often cut into faceted type.

　　② There is a bright light band on the surface of the cat's eye emerald, which will move with the rotation of the gem or light, just like the eyes of a flexible kitten.

　　3 change stones. Metamorphic stone is also an important kind of emeralds. Metamorphic stone has a special color-changing effect. Due to the selective absorption of light by Cr ions in gemstones, the color of gemstones will change under different light sources. In business, metamorphic stone is also called "Alexandrite". Miraculously, metamorphic stone turns green in sunlight or fluorescent lamp, like emerald, and turns red in incandescent lamp or candlelight at night, like ruby, so it is also known as "emerald in the daytime".

　　(4) Stone-changing cat's eye refers to a chrysoberyl with two special optical effects, namely cat's eye effect and discoloration effect, which is a more precious and rare gem.

　　⑤ It should be noted that according to the national standards, only emeralds with cat-eye effect and color-changing effect can be directly called opal and metamorphic stone, and other gemstones with cat-eye effect or color-changing effect need to be named with their mineral names, such as color-changing spinel, color-changing sapphire, quartz cat's eye, jasper cat's eye and so on.

　　2. The origin of Golden Green Treasure. One, Russia. The best metamorphic stone, that is, the metamorphic stone with the best color-changing effect, is produced in the Urals region. Second, Sri Lanka. Sri Lankan placers produce large yellow-green metamorphic stones and high-quality cat's eye gems. Third, Brazil. Apart from Sri Lanka, the main producer of chrysoberyl is Brazil at present. The discovered chrysoberyl varieties include transparent yellow and brown chrysoberyl, good cat's eye and high-quality metamorphic stone.

　　3. The three elements of the value of golden green cat's eye are color, shape and weight of bright band. The highest "golden-green cat's eye" is "honey-colored cat's eye", which is yellow-brown like honey. Bright band is another main factor to measure the value of opal, and its evaluation has two points: the first is eyeliner. Eyeliner must be sharp, straight, continuous and clear; The second is the opening degree. The bright band should be located in the center of the gem arc surface, slender, clear and flexible to move. It is illuminated from the side with a single light source, and the colors on both sides are different. Generally, the higher the transparency, the better, but the cat's eye is translucent, which will affect the eyeliner. Cat's eyes are round, so the criterion for judging cat's eyes-perfect circle is the best.

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