PL 18K 18K 18K 9K 9K 9K PA PL 18K 18K 18K 9K 9K 9K PA Length: 4.37mm Length: 4.37mm Width: 4.35mm

Differences in Diamond Grading

Differences in Diamond Grading

Are all independent diamond certificates created equally..? No. Read on to find out more about the differences between the grading of the different laboratories

If you've delved deep enough into finding out the quality of a diamond, you'll understand that it's vital to ensure you're diamond has been independently certified. Here we go a bit deeper into the differences between the independent laboratories.

To begin, it's worth pointing out that each of our diamonds is certified by one of the following professional independent organisations:

GIA Gemological Institute of America
EGL USA European Gemological Laboratory USA
AGS American Gem Society Laboratories
HRD Hoge Raad voor Diamant (Diamond High Council)
IGI International Gemological Institute

Here’s where it can get a little bit confusing. Whilst all these laboratories do a lovely job of certifying diamonds, they don’t always agree on how diamonds should be graded. They each have their own specific criteria for determining the colour and clarity grades and some laboratories are stricter than others.

The following handy tables show our experience of the differences in colour and clarity grading between the major labs, so you can more easily compare diamonds certified by different labs.

Colour Comparisons GIA AGS HRD IGI EGL USA
Whitest D D      
Ultra White E E D    
Very White F F E D D
White G G F E E
White H H G F F
Very Slight Yellow I I H G G
Slight Yellow J J I H H


Clarity Comparisons GIA AGS HRD IGI EGL USA
100% 10 x Loupe Clean FL/IF IF      
100% 10 x Loupe Clean to the untrained eye VVS1 VVS1 LC/LC+ IF  
100% 10 x Extremely Clean with Loupe VVS2 VVS2 VVS1 VVS1 IF
100% Very Clean with 10 x Loupe VS1 VS1 VVS2 VVS2 VVS1
100% Eye Clean VS2 VS2 VS1 VS1 VVS2
90% Eye Clean SI1 SI1 VS2 VS2 VS1
50% Eye Clean SI2 SI2 SI1 SI1 VS2
Not Eye Clean I1 I1 SI2 SI2 SI1
Not Eye Clean I2 I2 I1 I1 SI1

As you can see, a diamond graded as G colour, VS2 clarity by GIA is likely be graded E colour, VVS2 clarity by EGL USA.

You might be wondering, here must be an easier way to compare diamonds when the certifying laboratories can’t even agree! Don’t worry – this is why we developed our unique DiamondScore.

DiamondScore takes these grading differences into account and gives you one clear mark out of ten for each diamond, so choosing the best quality diamond couldn't be easier.

Find out more about DiamondScore here

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