What are the characteristics of sapphire?
What are the characteristics of sapphire? Sapphire, English name is Sapphire, mineral name is corundum, chemical composition is aluminum oxide (Al2O3). Mohs hardness of 9, relative density of 4.00 (± 0.05), with rubies side by side behind the diamond. Glass luster to yam diamond, transparent to translucent. Sometimes there are special optical effects, such as the starlight effect, which reflect the fascinating six-shot starlight under the illumination of light. At present, in addition to the red corundum in the world, the other gem-quality corundums are collectively referred to as sapphire. Sapphire can be divided into blue sapphire and brilliant (non-blue) sapphire, and blue is best made in Indian "corner blue". The colors are various blue and green, yellow, orange, pink, brown, gray, black, colorless, and the like. Color: Color is the most important factor in determining its quality and value. First of all, the color should be pure, the sapphire is mainly blue, and can be divided into pure blue, purple blue, milk blue, black blue, green and blue, among which the medium blue, the pure blue without green color is the best. color. In addition, the color should be uniform, especially when the sapphire with colored ribbon is visible to the naked eye. Clarity: The purpose of evaluating sapphire clarity is to determine the effect of inclusions (inclusions) or surface flaws on their aesthetics and durability to determine their impact on value. The judgment of clarity is mainly based on the naked eye, supplemented by a magnifying glass. The clarity classification should consider the factors such as the nature, size, number, position, and contrast of the main stone color. Generally, the higher the purity of the colored gemstone, the better, but there is absolutely no gemstone with no inclusions. It is not as good as the naked eye. The top of the inclusion can not be seen with a magnifying glass of 10 times. For natural colored gems, there are inevitably a variety of inclusions, and the number of inclusions is not as important as a diamond for colored gems. The inclusions are not visible to the naked eye, or the inclusions are small, or the cracks do not develop to the surface of the stone, which has little effect on the quality and value of the stone. Cut: The cutting of sapphire is mainly considered from the aspects of ç¢ type, proportion, symmetry and degree of modification. The ç¢ type refers to the shape of jewel cutting, which is usually oval, round multi-faceted, emerald-shaped and so on. The ratio refers to the ratio of the waist width of the dome to the full depth, and the generally acceptable ratio is 60% to 80%. Symmetry refers to whether the waist circle is symmetrical, whether the bottom point is eccentric, and whether the table top is tilted. The degree of modification refers to the uniformity of the facet alignment and the polishing quality. In the overall quality evaluation of sapphire, the effect of the degree of modification will be small. Weight: Weight is the most definite value factor. The greater the weight of a gemstone, the higher the value. The main producing areas of sapphire are Sri Lanka, Myanmar, India, Thailand, Australia, Vietnam, and China. The best quality is sapphire from Sri Lanka and Myanmar. Jacquard Weave,Jacquard Textile,Jacquard Pattern,Cotton Jacquard Fabric SHAOXING SHUKE IMPORT AND EXPORT CO.,LTD , https://www.shuketex.com