The cut of a diamond determines its fire, sparkle and brilliance by affecting how it reflects light. To determine the quality of a cut, pay attention to its shape, depth, polish and symmetry.
Diamond Cut Grade
The Gemological Society of America ranks diamond cuts as excellent, very good, good, fair and poor. These are based on the diamond's proportions, symmetry and polish.
Polish
This refers to a diamond's surface quality. Nicks and abrasions decrease a diamond's value.
Symmetry
A diamond's value increases when its shape and the alignment of its facets are symmetrical.
Depth
If a cut is too shallow, it will lose brilliance when light leaks from the bottom. A diamond cut too deep can appear dark because it loses light from its sides.
Shape
Diamonds come in a variety of shapes, including round, oval, pear and heart. All of these shapes match their names. An emerald cut diamond is rectangular with cut corners, while a princess cut is a square shape. Trilliant cuts take on a triangular, wedge shape, and radiant cuts have a square or rectangular shape with more facets and increased brilliance. Cushion cuts are large, rectangular shapes with rounded corners similar to those common in the late 19th century.
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