Certificate is a very direct basis for determining the quality of a natural gemstone, gemstones want to circulate in the market, an authoritative and reliable gemstone certificate is essential!
Authority needs to be determined according to the type and identification direction. Because of different gem subdivisions, each laboratory has its own good and authoritative gem identification categories and directions.
✅GUBELIN
Gublin Gem Laboratory has a very large gemstone database and is currently one of the authoritative institutions in the world for the identification of colored gemstones, and its price is naturally high. With a long history, it is in the world’s leading position in gem treatment and origin identification.
✅SSEF
The Swiss Gemmological Institute, a famous European laboratory, is widely used for the identification of pearls and high-end precious stones due to its professionalism and history, and is trusted by world-renowned auction houses, royalty, jewelers and collectors.
✅GRS
Gem research Laboratory，a famous Switzerland’s private testing Laboratory, mainly for the world’s major precious stones testing, such as rubies, sapphires, emeralds and Chrysoberyl, etc. GRS currently enjoys a high reputation in the identification of colored gemstones, which is an identification certificate with a high market share. The commercial names of gemstones named by it: pigeon blood, royal blue, cornflower are widely circulated in the world, and have a high visibility in the Asia-Pacific region.
✅GIA(Gemological Institute of America)
GIA is an internationally renowned diamond appraisal institution, and the GIA certificate is a globally recognized authoritative and objective appraisal certificate, creating the diamond 4C grading system that is still in use today, and the founder of the diamond appraisal to the internationalization.
✅AGL
American Gemological Laboratories, one of the ten recognized authorities in the world for the identification of colored gemstones!
✅AIGS
Asian Institute of Gemological Sciences, the entire certificate provides gem properties, treatment, origin, etc., and is also the first jewelery education institution in Southeast Asia. AIGS is the first laboratory in the world to conduct systematic research on the color classification system of ruby and sapphire, which is now widely used worldwide. More authoritative in the field of red and sapphire ,more suitable for buyers, is a buyer’s certificate, more stringent than GRS.
✅Lotus (Lotus Gemstone Laboratory, Bangkok)
LOTUS GEMOLOGY certificate, only for ruby,sapphire and spinel service, for the origin and color evaluation, there is a very in-depth study.
✅GIC
Gemmological Institute of Colombo, the GIC certificate in Sri Lanka is equivalent to the National Inspection (NGTC) of China, and is one of the most important and authoritative identification certificates in the country.
✅EGL
EGL Sri Lanka (Emteem Gem Lab), a local private authentication institution, enjoys a very high reputation in the Sri Lankan gemstone circle.
✅GUILD (Gilder Certificate)
GUILD has accumulated a large number of precious standard sample data, with stable and authoritative academic standards, accumulated a valuable good reputation in the industry, especially the origin and classification of emerald, ruby,sapphire, spinel research has been widely recognized in the industry. Focusing on the detection of colored gemstones, in 2017, the emerald color grading system was jointly released with the Colombian National Laboratory (CDTEC), officially using “Verdant Green” as the top emerald color!
✅IGI
The International Gemological Institute is a very old gemological institute, a true trans-continental global laboratory in the world’s three leading authoritative authentication institutions.
Common certificates in China:
✅NGTC (National Jewelry and Jade Quality Inspection and Testing Center) : China’s most authoritative national inspection certificate, the founder of China’s first diamond grading standard, the certificate is issued quickly.
✅GIC (China University of Geosciences (Wuhan) Jewelry Inspection Center) : One of the most authoritative jewelry identification institutions in China.
✅GTC (Guangdong Jewelry, Jade and Precious Metals Testing Center) : Mainly for beads, jadeite, jade issued certificates.
✅GAC (China Jewelry and Jade Jewelry Association)
⚠️ Attention:
Some gemstones in different quality inspection stations will have a certain dispute, friends to buy jewelry or to see the real thing, can not only look at the certificate!
If you know of any other certificates, please feel free to add them in the comments section
