Very precious and precious golden emeralds?

This issue of Birthstone brings a brief introduction of gold emeralds, which are oxides of beryllium and aluminum, with excellent quality and extremely precious. Golden emeralds are generally thick plates and transparent glass, with different shades of green or yellow to brown, and some will emit different colors under different light sources.

The English name of golden emerald is Chrysoberyl, which comes from the Greek Chrysos and Beryuos, meaning "golden emerald". In the jewelry industry, it is also called "golden green jade" and "golden green beryllium". Emerald itself is a rare mineral, and even fewer can form cat's eyes and change color, so it is very precious. Among emeralds, the most famous is the golden green cat's eye.

Emerald is usually transparent and yellow or yellowish green, hence its name. Most of them are cut into faceted gems to show their excellent fire colors. Origin: Brazil, Sri Lanka and Madagascar. The market price is still low. Because it has all the advantages of high-grade gemstones and its special color, it is not excluded that the price of this gemstone will rise after people know it in time.

Gold emerald is an oxide of beryllium and aluminum, which is of excellent quality and extremely precious. Golden emeralds are generally thick plates and transparent glass, with different shades of green or yellow to brown, and some will emit different colors under different light sources. Emerald mainly occurs in granite pegmatite, fine-grained rock and mica schist, and also occurs in gravel layer as a clastic mineral. Because it is very hard and wear-resistant, it also exists in streams and gravel. Artificial methods can produce emeralds, but the quality is not as good as natural ones.

Emerald is an oxide, the main chemical component is alumina beryllium, and the chemical molecular formula is BeAl2O4. It belongs to orthorhombic system. Crystal morphology is often short column and plate. Colors are brown, green, yellow-green and yellow-brown. Transparent to opaque. The glass is greasy and shiny. The refractive index is 1.746- 1.755, the birefringence is 0.008-0.0 10, the dichroism is obvious, and the dispersion is 0.0 15. The hardness is 8.5, and the density is 3.71-3.75g/cm3. Shell fracture. Excellent toughness. Yellow-green emeralds will produce yellow-green fluorescence under short-wave ultraviolet irradiation. Not corroded by acid. Have a strange cat's eye or discoloration effect.

The chemical formula is similar to spinel, so it is also called beryllium spinel, but its crystal structure and crystal form are similar to olivine. Crystals are often thick plates; Heart-shaped twins or pseudo-hexagonal penetrating triplets are often formed (see figure). Good cylindrical cleavage. Mohs hardness is 8.5 and specific gravity is 3.63 ~ 3.83. Transparent, glassy, dark green or light green or yellow to brown. A variety containing a small amount of Cr3+ that is green in sunlight and red in artificial light such as transmitted light and candlelight is called metamorphic rock, and it is called emeralds in the gem circle of China.

The other species is light green, with milky white and vivid light (see timely minerals), because it contains many microscopic cavities and parallel needle-like inclusions, and is called emerald cat's eye. It is also called oriental cat's eye and Ceylon cat's eye, because it is mainly produced in Sri Lanka. The most important emerald producing area in the world is Minas Gerais in Brazil, while Urals in Russia and Sri Lanka are famous producing areas of metamorphic rocks and golden green opal respectively. Emerald can also be synthesized artificially by flame melting, but as a gem material, its quality is far inferior to that of rock crystal.

The transparent crystal of chrysoberyl is also a precious gem because of its high hardness. Technically, the color is as bright as light tea, such as brown, green and yellow, transparent, with few defects, and the crystal diameter is greater than 3 mm. After pondering, it is often a collector's treasure. As early as the beginning of19th century, the American Museum of Natural History acquired a golden emerald named "Hope", which was described as follows: "This rare gem is excellent in transparency, sparkling and free from spots and other defects. Its extraordinary huge particles are unparalleled in the world. Nature is regarded as a rare golden green jade? "

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