EGL vs GIA
The three major US diamond laboratories – what you should know:
- GIA = Gemological Institute of America
- EGL USA = European Gemological Laboratory [USA]
- AGS = American Gem Society
It is important to know that Diamond Laboratories certify all diamonds submitted for grading and any certificate [including GIA] does not guarantee the brilliance, desirability or correct value of a diamond.
Determining brilliance, cut and correct value for any diamond requires experience, market knowledge in addition to gemological training. There can be a striking difference in the correct value of 2 diamonds with identical certificate grades.
Color is defined by all 3 laboratories in 3 broad categories:
Colorless = D, E, F
Near colorless = G, H, I, J
Distinct color = K to Z
A good faith difference of opinion exists between diamond laboratories as to where on the color spectrum each specific color grade belongs. As a result, the identical diamond submitted to the GIA, AGS or EGL US will rarely get the same color grade.
Certificate color grades describe the amount of color present in a diamond. While the most common color tint in a diamond is yellow, many diamonds have a core color that may be light brown, blue, green, gray, pink etc.
The GIA typically downgrades diamonds not strictly on a ‘yellow spectrum’ by one or more color grade, whereas EGL US and AGS often consider the absence of yellow a positive characteristic and provide higher color grades for the best of these diamonds..
Clarity grades are based on the quantity, size and position of inclusions under 10 x magnification. GIA clarity grades may be one clarity grade stricter than EGL US or AGS, however in our experience it is not unusual for all 3 laboratories to provide identical clarity grades.
Diamonds are the most intriguing and brilliant of all gemstones. Buy your diamond from a company with an impeccable reputation, willing to educate each client and provide a selection of impeccably screened stones to choose from.Ask Us a Question