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4C’s of diamonds: Color grading of white diamonds is better understood as a scale to describe LACK of color. The dispersion of light into the spectral colors, known as brilliance, is not a part of this topic.
Cut, as it relates to the 4C’s of diamond grading, is a measure of craftsmanship and quality of cut. The term also is used synonymous with shape, round, oval, etc.
Sapphire is the mineral corundum. Blue ones are the second most popular of the world’s gems, after diamonds.