What is diamond grading?

A diamond under One step of the GIG grading process

Diamond Grading involves evaluating the qualities of an individual diamond and deciding how its qualities reflect its rarity and value.

Diamond value is based on the famous 4Cs: Cut, Clarity, Color and Carat Weight. The 4Cs are the four main characteristics that influence and illustrate the beauty of the Diamond, not only the value. They assist, gemologists, trading operators and retailers to compare one diamond to another.

Cut refers to a diamond’s shape, faceting style, proportions and the quality of its finish. A well-cut diamond captures the light around and allows light to reflect of it in a breathtaking way.Clarity is the relative absence of clarity characteristics, divided in inclusions and blemishes.Color relates to the amount of bodycolor in a diamond. Truly colorless diamonds are extremely rare and valuable. Most diamonds used in jewelry stores are near colorless, with at least some traces of yellow and brown.Carat weight is the weight of a diamond expressed in metric carats. A carat is equal to 0.200 g. The value of a diamond is built considering all the 4Cs as one. 

The GIG Diamond Report draws out the 4Cs very clearly in both formats : the extended Diamond Report and the compact Diamond Report. The GIG reports also contain the reference Grading Scales, to make it easier to understand Clarity, Color and Cut grading. When it comes to trading it is common to consider one more C, the certificate. A diamond certificate is known as, the Diamond Report and is crucial for trading operations. It guarantees that a diamond: the object of purchase, is off the quality expressed in the report and therefore any kind of negotiation is taking place on the correct economic parameters.

GIG advises to always to ask for a Diamond Report before buying a diamond or any kind of gemstones.