Articla - GIA

The World's Foremost Authority in Gemol

GIA is the world’s largest and most respected nonprofit institute of gemological research and learning. Conceived 75 years ago in the grand tradition of Europe’s most respected institutes, GIA discovers (through GIA Research), imparts (through GIA Education), and applies (through the GIA Laboratory and GIA Instruments) gemological knowledge to ensure the public trust in gems and jewelry.

How GIA Estimate a Cut Grade ?

GIA estimate a Diamond Cut Grade with advances in computer modeling. They have been able to unlock the mystery of diamond cut — arguably the most complex and contested of the 4Cs. After more than 15 years of research and discovery, GIA has developed a scientific way to assess — and predict — the cut quality in round brilliant cut diamonds.

GIA has also developed software that provides a method of estimating a cut grade — and a database that is embedded into a number of leading diamond measuring devices so that this estimation can be automated. As a result, manufacturers can plan and, in effect, predict cut grades, buyers can compare cut qualities, and retailers can communicate the effects of cut on round brilliant diamonds.

A GIA Report does not mean the diamond is
a "GIA certified diamond"
The GIA does not certify diamonds

Source: http://www.gia.edu/