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Diamond cut is graded on a scale ranging from Excellent to Poor. Cut grade is determined by the diamond's proportions and symmetry, which directly affect the way the diamond returns light to the viewer. For example, a pavilion that is cut too shallow or too deep will not make optimal use of light, reducing the diamond's brilliance, and will therefore have a lesser grade.
Slide to compare diamond color from colorless (D) to light yellow (Z)
During its long formation process, the diamond develops a natural hue. White diamonds are not really white – they are in fact colorless and pure. It is the absence of color that makes them so rare and valuable. Most diamonds, however, develop a tinge, whether slight or more obvious to the eye, as a result of the diamond's chemical make-up or defects to the structure of the crystal lattice. The color grading scale for white diamonds ranges from D (colorless) to Z (light yellow).
View the diamond's birthmarks and clarity map side by side
Diamonds are formed deep in the earth under incredible heat and pressure. In these conditions, the diamond develops natural 'birthmarks'. Clarity grade is determined by the presence or absence of inclusions and blemishes. The international Clarity standard presents a grading spectrum ranging from Flawless (FL) to Very Very Slightly Included (VVS), Very Slightly Included (VS), Slightly Included (SI) and Included (I). Flawless diamonds are extremely rare, making them more desirable and expensive.
Slide to see how a diamond looks in different sizes
Carat is a weight unit used to measure diamonds and gemstones. It was formally adopted in 1907 at the Fourth General Conference on Weights & Measures in France, and soon spread across the globe as the internationally recognized standard.
Carat weight is a unit of mass equivalent to 0.2 grams, expressed as carat points.