First, let's talk about the size of diamonds. The certificate of 0.4 1CT diamond should be graded in detail. The certificate of Geological University has not been sent to you. If you come in and ask before buying, I will strongly advise against buying. The definition level is not subdivided, and the color level is not subdivided. If you see such a certificate, it is recommended not to buy it. The University of Geology gives a vague answer, and the national inspection will also give a vague answer. You know, there are two grades of diamond VS clarity. VS 1 VS2, the color grade I~J is one grade, but there is a price difference between I and J, and K~L is also a grade, but there is also a price difference. The national inspection agency has strict requirements on color, so basically all diamonds that have passed the national inspection will be downgraded, but your downgrade is outrageous, because diamonds are not separated by two grades, such as I color.

Now the international certificate GIA is clearly divided, and the existing certificates in China are all in a mess. If identification is really needed, it is recommended to choose a foreign NGTC national jewelry appraisal agency. It is suggested that the landlord choose the national level for subdivision, clearly tell the appraisal institution, take the bare stone, do not tell them to do re-inspection, and do comprehensive appraisal directly. Issue their authoritative appraisal certificate.