Colored gem knowledge - garnet articles
The garnet gemstone is also known as the purple tooth, and the English name of the garnet is Garnet, which evolved from the Latin word "Granatum", meaning "like a seed." The shape and color of garnet crystals and pomegranate seeds are very similar, hence the name "garnet". Purple tooth is also called "Ziwuwu", and China's jewelry industry is also known as "Ravenwu". According to legend, the name comes from the ancient Arabic "toothed", meaning "ruby". Because the garnet gemstone color is dark red with purple, it is called "purple tooth black".
Gemstone Name: Garnet
Chemical composition: A3B2[SiO4]3
Crystal structure: equiaxed crystal system
Hardness: 6.5-7.0
Optical properties: refractive index 1.74-1.88
Specific gravity: 3.5-4.3
Origin: Sri Lanka, India, Madagascar, USA, China, etc.
Garnet has been used as a mineral of gemstones and abrasives in ancient times. Red garnet is often mistaken for rubies in ancient times. In Victoria, the red garnet was mistaken for rubies in her crown. The ancient Egyptians believed that Garnet hanging on the neck can be used as a body stone because its composition is a complex silicic acid compound, so it produces many different colors, red, orange, green, and black. Its formation is mainly in many magma or metamorphic rocks, and most gem-quality garnets are formed in alluvial sands.
In the Middle East, red garnet was chosen as the royal token, and in many countries in the West it was designated as “the birthstone of Januaryâ€. From this point, the garnet's popularity is known. Because of the high refractive index and strong luster of garnet, The color is beautiful and diverse, so it has long been favored by the jewellery fashion industry. It has been given different styles to show its uniqueness. In the international gem market, the number of large carats is pure, the color is bright, and the crystal clear garnet is very valuable. high.
Gemstones similar in color to various garnets include rubies, sapphires, artificial corundum, yellow gemstones, emeralds, jadeite, etc., all of which are heterogeneous and distinguishable under polarizers. It can be distinguished in terms of density, inclusion, refractive index, dispersion, fluorescence, and the like. The difference between garnet and synthetic green garnet is mainly in the inner inclusion and density. Synthetic green yttrium gallium garnet, yttrium aluminum garnet, uniform color, no flaws, occasionally a small amount of bubbles, red under the color filter. Density: é’† gallium garnet 7.05 g / cm3, é’‡ gallium garnet 4.58 g / cm3, are much higher than natural garnet. In addition, the refractive index and dispersion are also unique and can be distinguished.
The evaluation and purchase of garnet is based on color, transparency and particle size. Standard requirements for gem-quality garnet: good transparency, bright colors, and particle size greater than 5 mm. In the international gem market, pure and flawless, bright colors, crystal clear garnets are of high value. Emerald chrome vanadium garnet has the highest value, and the superior quality can be compared with emerald. Red, orange-red garnets are also very valuable.
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