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4 C’s of Diamond Grading

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GIA - GEMOLOGICAL INSTITUTE OF AMERICA

Founded in 1931, the Gemological Institute of America, or GIA, is the world’s foremost authority on diamonds and other gems. A non-profit organisation, the GIA upholds the highest standards recognised by the diamond industry. In 1953 the GIA developed the 4Cs, and established their diamond and gemstone grading system, which today, is a worldwide standard. Two years later, in 1955, they issued their first diamond grading report. Each diamond graded by the GIA is examined by at least four highly trained and experienced gemologists. To ensure the process is completely objective, diamonds are randomly assigned to graders. Each diamond graded by the GIA is accompanied by a GIA Grading Report. This report details the diamond’s 4Cs (cut, colour, clarity and carat weight), as well as notes on the stone’s polish and symmetry, and fluorescence. Most often the report also contains a diagram of the diamond which indicates clarity characteristics, a proportion diagram and GIA grading scales.

The GIA has graded and certified some of the most famous diamonds in the world, including the Centenary Diamond and the Hope Diamond. Their headquarters is in California, USA, but the GIA operates out of 13 different countries, such as New York, Hong Kong and Moscow, to name a few.

The GIA aims to protect buyers and sellers of diamonds and other gemstones. By setting and maintaining the standards that are used to evaluate gemstones, the GIA is a trusted source of information for buyers and sellers worldwide.

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