Common types of diamond certificates
International certificate
There are four kinds of international certificates for big diamonds: GIA, IGI, HRD and EGL.
1, gia-American Gemological Institute (diamond 4C standard setter)
2.IGI- International Gemological Institute
3.HRD- Belgian Diamond High Council
4.EGL- European Gemological Institute
Diamond grading report
National inspection certificate
1, NGTC diamond grading certificate-National Jewelry and Jade Quality Supervision and Inspection Center
2.GIC diamond grading certificate-Beijing Gemstone Testing Center of China Geo University.
The national inspection certificate is the most common one besides the international certificate. Among them, NGTC (National Jewelry and Jade Quality Supervision and Inspection Center) is a jewelry and diamond appraisal center that cooperates with GIA institutions and belongs to the national nature of China. NGTC certificate is not only used to inspect bare diamonds, but also used to inspect diamond rings and other finished jewelry inlaid with diamonds. In addition, there are GIC and other domestic diamond appraisal certificates.
What kind of diamond certificate is more authoritative?
The diamond certificates listed above are recognized as authoritative certificates by people in the industry and consumers, among which GIA International Diamond Certificate is the most famous. In the process of buying diamonds, if it is a big diamond with more than 30 points, GIA certificate can be used as the standard; Domestic NGTC and GIC diamond certificates can be used as authoritative reference for small-fraction diamonds, and domestic appraisal certificates are more suitable for domestic diamond purchase.
Experts all know that it is impossible to tell whether diamonds are natural, synthetic or processed by the naked eye. Therefore, it is very important to issue a reliable certificate in an authoritative jewelry appraisal and testing institution. However, you find that more than one institution issues diamond certificates. You must be curious whether different certificates will bring different appraisal and grading results.
GIA certificate
Full name: American Gemological Institute
Chinese name: American Jewelry Association
Starting year: 193 1 year
Certificate status: the founder who founded the diamond 4C grading system that is still in use today and pushed the diamond appraisal to internationalization.
The biggest feature: As a standard maker, GIA is absolutely the most accurate in controlling 4C grading standards.
GIA certificate
You should know this secret: the price of diamonds with GIA certificate is higher than other certificates, not only because the appraisal cost of GIA certificate is higher, but also because people generally trust the appraisal results of the institutions designated by this standard in terms of liquidity and credibility.
Comments: When it comes to diamond certificates, many people will think of GIA. In the market, the use of GIA diamond certificate can almost be called the mainstream, even the most authoritative and objective diamond certificate. Maybe every organization can do digital test results, but only GIA can create test systems.
Human resource development certificate
Full name: Hograd Wall Diamond
Chinese name: Belgian Diamond High Council
Starting year: 1973
Certificate status: Established in Antwerp, Belgium, the diamond cutting center has jointly drafted the IDC standard of "International Diamond Grading Standard" with the International Diamond Committee.
The biggest feature: HRD is particularly outstanding in distinguishing the color grade and naturalness of colored diamond.
You should know this secret: HRD diamond certificate also introduces a fast "diamond identification certificate" for diamonds below 1 carat. The content is clear at a glance, but the information points are rarely brief.
Comments: HRD diamond certificate uses more descriptive language. Different from other certificates, it uses phrases such as "white" and "light white", and the color levels below n are no longer distinguished.
IGI certificate
Full name: Gem College
Chinese name: International Gemological Institute
Starting year: 1975
Certificate status: the world's largest independent jewelry appraisal laboratory, with laboratories in major diamond trading centers around the world, is known as the "authoritative appraisal institution around consumers".
The biggest feature: IGI can issue certificates for diamonds of any size in various formats and formats, which is convenient to carry around. Although the small certificate sparrow is small and complete, regardless of the layout, each certificate is issued in accordance with strict international standards and has multiple anti-counterfeiting measures.
You should know the secret: the IGI certificate describes the cutting information very accurately. Under Finish, the proportion description of symmetry, grinding and proportion is subdivided, and the details of diamond bottom tip and waist are also described.
You can know more: IGI has a very rich history! It started from the private collection of Belgian diamond family, and later attracted the attention of various royal families in Europe. It can give detailed and accurate identification results for crowns, necklaces and rings that have been inlaid with complexity, so it is trusted by more and more people. Moreover, IGI developed the world's first complete and comprehensive diamond cutting grade map, which later became the embryonic form of the evaluation standard of modern diamond cutting system.