1, waist lettering.
The unique number corresponding to the diamond identified by GIA certificate is engraved on the waist of the diamond by laser, which is equivalent to the ID number of the diamond. This string of codes is preceded by the word GIA, all of which are hollow.
2. Watermark.
When the GIA certificate is pointed at the light source, you can see the watermark of the GIA certificate, and the certificate card has the same anti-counterfeiting strip as the metal diamond stripe.
3. Micro-printing line.
The vertical lines in the list of clarity, color and cut level in the GIA certificate are spelled in the English full name of GIA, which can be seen by professionals through a magnifying glass of 10 times, and generally we can see clearly under a microscope with higher magnification.
4.GIA special blue ink shading.
GIA certificate grading evaluation part of the shading uses a special inkjet printing technology, which will present a diamond shading.
Extended data:
GIA certificate name source:
GIA is an American Gemological Institute with a global scale comparable to IGI, which was first established in the United States in the 1930s. But the real large-scale development was in the 1950s, which happened to be the period of great development of American industry and consumption.
Therefore, there is an urgent need for a unified standard that can be replicated on a large scale to meet people's large demand for diamonds.
Therefore, GIA summed up the previous experience, systematically put forward the concepts of "clarity" and "color" used by merchants in previous industries when selecting gems, and formally put forward the 4C statement in 1950s, which played an important role in the rapid development of jewelry industry in the future.
And in the following time, many instruments for analyzing gems were also introduced, which facilitated the insiders to identify gems more efficiently.
It can be said that American Gemological Institute is a pioneer in the standardization and popularization of jewelry industry. Its positioning has always been loyal to serving the middle class with the most consumer confidence and the largest number. Therefore, GIA has many fans in the United States, and relatively speaking, high-end jewelry in Europe is used less.
What we don't know is that although GIA is a non-profit organization, most of its funds are sponsored by major jewelry companies in the United States. The appearance of its certificate is also in line with the development interests of American jewelers, and it also provides identification certificates for many consumer brands facing the public.
For example, the famous American online shop "Blue Nile" focuses on mainstream middle-class men, and basically uses GIA and AGS certificates. When Tiffany took the middle-class route, she used a lot of certificates from American Gemological Institute. With the deviation of self-positioning and brand marketing from GIA mass positioning, I began to use my own certificate.
GIA certificate emphasizes unity. There is a sense of standardization like an assembly line. From the page of the certificate, the star's jewelry and the goods in the street shop all use the same plate making and design. GIA India, GIA America and GIA Hong Kong can't tell their different distribution places.
Just like McDonald's and GAP in America, they are the certificates of every policeman, teacher, fisherman and worker in the world. Therefore, it can be said that American Gemological Institute meets the consumption needs of most people in modern industrialization.
At the same time, in China, with the reform and opening up, GIA certificate also entered the China market with the influx of American diamonds in the 1990s, becoming one of the international certificates with high recognition in China.
Similar to the GIA certificate, IGI International Gemological Institute, which focuses on the high-end market, and NGTC, the most authoritative national jewelry and jade testing center in China.
Baidu encyclopedia _GIA certificate