A diamond certificate is a document issued by a gemological laboratory, which describes, as objectively as possible, a number of physical characteristics of a loose diamond. A diamond described by such a certificate is said to be "certified."

The Gemological Institute of America (GIA) Gem Trade Laboratory has literally set the industry standard for diamond grading and gemological identification. In 1953, GIA created the international diamond grading system, which is the standard recognized by virtually every professional jeweler and diamond broker in the world.

Today, the GIA Diamond Grading Report™ serves as the international gem and jewelry industry's benchmark credential. GIA Diamond Grading Reports are regarded throughout the gem and jewelry industry worldwide as the hallmark of integrity, reliability, and consistency in diamond grading.