The Diamond Grading System - Diamond Authority
The Diamond Grading System - Diamond Authority
Apr 26, 2011
thediamondauthority.org
1.9K views · 52 reactions | By creating the 4Cs of Diamond Quality and the International Diamond Grading System™, GIA set the standard for describing and evaluating diamond quality anywhere in the world. Watch this video to learn the history of the 4Cs. | GIA Education | Facebook
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