They are the GIA, AGS, EGL and HRD. The GIA or Gemological Institute of America is one of the most known and accredited organizations in the country. Any gem or stone coming into the United States will first be viewed by the Gemological Institute of America. The second one is the AGS or The American Gem Society is the second most well-known organization and they use a grading system based on their three Cs of the diamond grading system. The EGL or European Gemological Laboratory offers a wide-range of services regarding gemstones such as diamond certificates, reports, laser inscriptions, HPHT treatments and more!
The European Gemological Laboratory is more about the services regarding the diamond, but they also do review diamonds for grading reports as well. Lastly, you have the HRD or the Hoge Raad voor Diamant which translates into Diamond High Council is Europes counterpart with the GIA and offers grading reports and techniques for how high of a quality the gemstones are and what they are "graded" as being. Each of these grading institutes are going to be for different countries and will control different gemstones and diamonds coming in (or out) of the United States and other countries.
By making sure YOUR diamond includes one of these major grading systems you can ensure yourself that you really are buying a diamond worth the money. It doesn't matter if you want to buy diamonds online for single use or for use with something like white gold diamond engagement rings or diamonds engagement rings, visiting a quality jewelry store online could mean the difference between getting cheated and buying a gem or diamond that is really what you want and desire.
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