The cleanliness of vs 1 is also moderate, and LC is the best. The section is g, but it belongs to the middle and lower level. It is best that VG of EX is one step higher than g. GIA certificate is good and trustworthy. Generally speaking, the quality is below average.

Color: Diamonds have many natural colors, from precious colorless (white after cutting) to rare light blue, pink to yellowish. The brighter it is, the more white light can be transmitted, and the richer the color is after refraction and dispersion. The grading of diamond color is determined by technicians repeatedly comparing the diamond to be graded with the standard color colorimetric stone in the grading environment of professional laboratories. The whitest diamond is classified as D (starting from the initial of the diamond), and * * is divided into 1 1 grades, which are D, E, F, G, H, I, J, K, L, M and N in turn.

Cleanliness: Diamonds are crystallized from mantle magma deep in the earth, with complex environment, diverse components and extremely high temperature and pressure. After hundreds of millions of years of geological changes, the color, quantity, size and location distribution of various impurities will inevitably have different degrees of influence on the clarity of diamonds. Usually, a magnifying glass with a magnification of 10 is used to subdivide the clarity level of diamonds, and it is not inlaid as LC, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, P 1, P2 and P3 * * * 655. Diamonds are divided into five grades: excellent, good, medium and good.

Cut: The brilliance of diamond is attributed to its unique high refractive index and high dispersion. However, uncut diamonds are just plain in appearance. Only through accurate calculation, careful design and perfect cutting and polishing can light be fully reflected from the top surface and beautiful diamonds shine. Diamond is a hard substance, indestructible and never worn. Once cut and ground, it will shine forever. Turner's grades are: perfect ex, good VG, good G, average.