Diamond certificate, can also be called the diamond grading certificate (diamond grading report), diamond quality guarantee (diamond quality report), is about the diamond on the basis of the 4 c standard, is a jewelry experts in a specific environment according to the classification standard of strict careful observation and detection of diamond to form a report.Which put diamonds at 10 times the magnifying glass under the analysis of its size, clarity, cut, polished, symmetrical features is one of the important link, also including the color of the diamond level, fluorescence detection, etc.


Gemological Institute of America

In 1931,the GIA developed its international Diamond Grading System and the Four Cs (cut, clarity, color and carat weight) as a standard to compare and evaluate the quality of diamond.

oDiamond certified by GIA has a higher price on the market compare to other certification. It is not only because of the GIA identifying cost is high, but also due to the fact that the people believe in the result from GIA based on its popularity and recognition. Speaking from the market perspective, diamond with GIA reports is the main trend in Chinese diamond market.


Hoge Raad Voor Diamont

The HRD (Hoge Raad voor Diamant) Diamond High Council is a non-profit industry organization designed to promote and represent the Antwerp diamond trade was founded in 1973.

oHRD certificate plays an important in Europe marketplace. HRD’s color and clarity grading is strict, accurate, and consistent. HRD certificate has entered Chinese market since 2009; it has become the most recognized certification worldwide after GIA.


International Gemological Institute

The International Gemological Institute (IGI) was founded in 1975. It has now developed into the largest independent gem certification and appraisal institute. IGI’s unique United States patented process to laser inscribes numbers, letters, trademarks, and logos on the girdle of a diamond allows the diamond to be easily identified. IGI’s School of Gemology is first to conduct training course covering rough diamonds.

IGI’s School of Gemology was originally come from royal jewelry identification, and open to the public in 1975.IGI does not have any laboratory in China, but it does offer diamond-grading course in Shang Hai.