Cut refers to a stone’s shape, facet, and polish. Sometimes diamonds are cut so they’re heavier, thus fetching more value for their carat weight. Sometimes they’re cut to hide or minimize inclusions by expert diamond cutters skilled at bringing the brilliance out of each diamond they work with.
In general, there are three factors that determine a diamond's cut quality:
- Proportion: The relative size and angle of each diamond facet
- Symmetry: The precision of the cut design, especially the facets
- Polish: The smoothness and luster of the diamond's surface
For certified diamonds, cut grades are referenced on the diamond's certificate often using the GIA standards of Excellent, Very Good, Good, Fair, and Poor. The quality of a diamond's cut always speaks for itself. The cuts can take shape in a number of ways to work with many types of jewellery and personal preferences: