The Gemological Institute of America was founded in 1931 in Los Angeles, California. It is famous worldwide because it has created and introduced the current International Classification System.
This method is known as “4Cs”: Cut, Clarity, Color and Carat. These are the main elements to evaluate diamonds worldwide.
The peculiarity of G.I.A is its certification, it is one of the most prestigious ones and internationally valid. Their lab analyses the stone and marks the certification number on its girdle.
The main internationally recognized institute of color diamonds certifications.