Ruby grades are based on 1T and 4C: Transparency, Colour, Clarity, Cut, Carat. Transparency: refers to the degree to which the gem allows the transmission of visible light. In the naked-eye identification of rubies, transparency is generally divided into: transparent, sub-transparent, translucent, sub-translucent, opaque five levels. Color: refers to the natural light in the gem of the color. As the light source will have a great impact on the color of sapphire, so the classification of sapphire observation methods clearly required. Clarity: refers to the number of gem contents. Ruby and Sapphire usually contains a certain amount of content, the size of the content, the number, the degree of distinctiveness, the location of the value of Ruby and Sapphire has an important impact. Under the naked eye observation, the ruby and Sapphire grade is divided into five grades, Ruby grading evaluation criteria. Cutting: including the direction of cutting grinding, type, proportion, symmetry, degree of polishing, etc. . Carat weight: refers to the weight of the gem. Ruby and Sapphire of the same quality, the higher the weight, the higher the price, especially the price of more than 1 carat of high-quality ruby and sapphire is increasing geometric progression. The size and weight of common sapphire carvings table lists the size and weight of common sapphire carvings corresponding relationship. Therefore, in your choice of favorite Ruby Bracelet, Ruby Rings, Ruby earrings, and so on when the jewelry can be graded Ruby Evaluation Criteria as a basis to choose a safe ruby jewelry.