January birthstone-Garnet Ziyawu refers to garnet gem. The English name of garnet evolved from the Latin "Granatum", which means "like a seed". Garnet crystals are very similar in shape and color to pomegranate seeds, hence the name "Garnet". Ziya House is also called Ziya House, and it is also called Ziya House in Chinese jewelry industry. According to legend, its name comes from the ancient Arabic word "Wu Ya", which means "ruby". Garnet is called "purple tooth black" because of its deep red and purple color.

Chemical composition: A3B2 [SiO2] 3.

Crystal system: It belongs to equiaxed crystal system.

Refractive index: 1.74- 1.88.

Hardness: 6.5-7.5,

Density: 3.5-4.3g/cm3.

Origin: Sri Lanka, India, Madagascar, USA, China and other countries. Gem-grade garnet minerals have been found in more than ten provinces in China.

There are many primary deposits in Ziyawu, mainly occurring in magmatic rocks or metamorphic rocks, and gem-grade garnet is mostly found in alluvial placers. Ziyawu is a garnet mineral and a silicate mineral with complex chemical composition, which is usually represented by A3B2 [SiO2] 3. Wherein a represents divalent cations such as Ca2+, Mg2+, Fe2+ and Mn2+, and b represents trivalent cations such as Al3+, Fe3+ and Cr3+. The crystal morphology is rhombic dodecahedron, quadrangular octahedron or a combination of the two. Aggregate is granular or massive. The color of garnet is influenced by its composition, showing a variety of colors, including red, purple, crimson, orange, yellow, green, brown and black. The crystal surface has glass luster and diamond luster, and the fracture surface has grease luster. Transparent to translucent. Isotropic objects are neither polychromatic nor birefringent. Garnet can be divided into almandine series (Mg-Al garnet, Al-Al garnet, Mn-Al garnet) and andradite series (Ca-Cr garnet, Ca-Al garnet, andradite).

The difference between garnet and similar gemstones and synthetic garnet. Ruby, sapphire, artificial corundum, topaz, emerald, jadeite, etc., which are similar in color to various garnets, are all anisotropic and can be distinguished by a polarizer. It can be distinguished from density, inclusion, refractive index, dispersion and fluorescence. The difference between garnet and synthetic green garnet mainly lies in internal inclusions and density. The synthesized green gadolinium gallium garnet and yttrium aluminum garnet are uniform in color, flawless, with occasional bubbles, and appear red under the color filter. Density: Gd-Ga garnet 7.05g/cm3, Yttrium-Ga garnet 4.58g/cm3, far higher than natural garnet. In addition, refractive index and dispersion also have their own characteristics and can be distinguished.

Evaluation and purchase of garnet. The evaluation and purchase of garnet are based on color, transparency and particle size. The standard requirements of gem-grade garnet are: good transparency, bright color and particle size greater than 5 mm. In the international gem market, pure and flawless garnet with bright color and crystal clear is of high value. Emerald Cr-V-Al garnet has the highest value, and its high quality can be compared with emerald. Red and orange garnets are also valuable.

Purple tooth black is one of the common low-grade gems at present. The variety with rich and pure colors and high transparency is the best of Ziyawu. With high refractive index, strong luster and beautiful colors, it is a favorite gemstone variety. Many countries in the world regard Ziyawu as "the birthstone of January", which symbolizes loyalty, friendship and chastity. Westerners believe that purple tooth black has the magical effect of treating diseases and saving lives; In the Middle East, Ziyawu was chosen as a royal pledge.

In geological museum, China, there is an orange-red garnet crystal, weighing 1397 carats, produced in Xinjiang. The National Museum of Natural History of the United States has the best brown transparent cinnamon stone (Fe-Ca-Al garnet) in the world. It is a beautifully carved head of Christ, weighing 6 1.5 carats, which is priceless.

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Mental function:

(1). It is helpful to improve blood diseases, promote circulation, enhance vitality, and then get the effect of beauty beauty. It is the first choice for beautiful women.

(2) It is helpful to improve the function of reproductive system, enhance the body's regenerative ability and accelerate wound healing.

(3) Workers who often stay up late, work overtime and are tired day and night can actively recover their physical strength.

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Function of garnet: Natural garnet can make people have irresistible charm, attract happiness and eternal love, increase self-confidence, resist depression, help people face traumatic memories of the past, interpret and understand from another angle, and achieve a calm and happy situation. Can enhance vitality, vigor and endurance, and can also be worn when sleeping. It can stimulate blood circulation and hormone secretion, and is beneficial to the health of reproductive system and related organs; Promote regeneration and blood circulation, and have the effect of skin care and rejuvenation. Can improve dermatosis and prevent wound from getting worse. Increase people's thinking inspiration, ward off evil spirits, and become a protective stone from external forces. Corresponding to the submarine chakra, activating the spleen through thinking can increase sexual ability and purify the spleen, which is said to be effective for arthritis. This is a good gift for my friends and myself. Red "garnet" also has the special effect of promoting blood circulation and strengthening the heart, which is most suitable for women who are weak and afraid of cold to use or wear.