GIA is a certificate of jewelry appraiser issued by China Geo University.

CGC is a quality inspector of jewelry and jade.

40 minutes, 30 minutes and 50c are the weight units of diamonds, 1g equals 4 carats (ct), and one carat equals 100 minutes.

Clarity describes diamonds, that is, the size of inclusions you see under the magnifying glass of 10 times to classify diamonds, which can be divided into LC vvs Si p.

Colors also describe diamonds, which can be divided into D, E, F, G, H, I, J, K, M, N, >; MN。 The color level is from high to low,

The greater the weight, the clearer the color and the higher the price.