World Gemological Institute

At World Gemological Institute, all of the gemologists are graduates of the Gemological Institute of America (GIA) with years of industry experience. Staff keep their training current through seminars, lectures and advanced gemological studies, including the Fellowship (FGA) through the Gemological Association of Great Britain (Gem-A).

Diamond colour is graded on the lack of colour. A pure, structurally perfect diamond has no hue, like a drop of clear water, which raises its value. The D to Z scale assesses colour by comparing a stone against master stones of established value. Cut is about how well a diamond's facets interact with light, which takes precise workmanship to get the proportions, symmetry and polish right.

Clarity comes down to the internal inclusions and external blemishes formed as the diamond grew under heat and pressure; the closer to pure, the higher the value. Carat weight measures how much a diamond weighs, with one metric carat set at 200 milligrams and each carat divided into 100 points for stones below a carat.

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