The red diamond is the king of diamonds. . What you see in the market is basically rubies. Colored diamond is the essence of diamonds, which is very rare. It is said that for every/kloc-0,000,000 gem-grade diamonds in the world, it is possible to meet a colored diamond. The formation of colored diamonds is due to the deformation of different chemical trace elements and internal crystal structure. Generally speaking, the rarer the color, the higher the color grade and the higher the value; The stronger the color, the higher the saturation and the higher the value. The value of colored diamonds in red series is the highest, followed by blue and green series, and the value of black diamonds is the lowest. The price of colored diamonds is more than 200 times higher than that of colorless diamonds with the same volume, and more than 2,000 times higher than that of Huang Jingui with the same weight. It is considered as "the most concentrated wealth in the world". Ruby knowledge: Ruby, English name ruby, mineral name corundum, chemical composition aluminum oxide (Al2O3), because of trace element chromium (Cr3+) and turned red to pink. Mohs hardness is 9 and relative density is 4.00 (0.05), which is second only to sapphire and diamond. Glass luster to sub-diamond luster, transparent to translucent. Sometimes there are special optical effects, such as starlight effect, which will reflect charming starlight under the irradiation of light. Colors are red, orange, purple, maroon and so on.

Ruby is mainly produced in Myanmar, Thailand, Sri Lanka, Viet Nam, Tanzania and China, but in terms of gem quality, Myanmar and Sri Lanka are the best.

The quality evaluation of ruby is mainly considered from the aspects of color, clarity, cutting and weight. Color: First of all, the color should be pure. Ruby has many colors, such as red, orange, pink, purple, brown and so on. Among them, pure red is the best, and pigeon blood red is pure red without any noise. In addition, the color should be uniform, especially when the ruby with ribbon is observed with naked eyes, it is best not to see the ribbon. Clarity: The clarity of ruby needs to consider two issues: first, the size, quantity, position and contrast of the flaw, that is, whether the flaw is obvious or not, and whether it affects the transparency. When the flaw is large and visible to the naked eye, or the flaw is small but distributed in a fine dispersion, which affects the transparency of the gem, the clarity grade will decrease. Secondly, the influence of defects on the durability of gemstones should be considered. For example, the durability of gems is affected by large cracks, and the purity quality will also decline. Cutting: the cutting of ruby is mainly considered from the aspects of cutting, proportion, symmetry and decoration. Cutting refers to the shape of precious stones, such as oval, round polyhedron, emerald and so on. Proportion refers to the ratio between the waist width and the full depth of the cut shape, and the generally acceptable ratio is 60% ~ 80%. Symmetry refers to whether the waist is symmetrical, whether the bottom tip is eccentric and whether the desktop is inclined. The degree of decoration refers to the uniformity of facet arrangement and polishing quality. In the overall quality evaluation of ruby, the degree of modification has little influence. Weight: Weight is the most definite value factor. The greater the carat weight of a gem, the higher its value.