Cut is used to describe the reflective qualities of a diamond and refers to the quality and preciseness of a diamond's outline, its shape and the placement and alignment of its facets. These factors, when ideal, contribute to maximize the stone's brilliance.

GWLAB uses the most advanced measurement and proportion scanners in its laboratories

The Cut grade is divided into three categories, each of which is graded according to 5 quality levels (Excellent, Very good, Good, Fair and Poor.) The categories are:

• Cut - compares the diamond's proportions to best light performance pre-calculations. The calculations of the diamond's proportions are carried out using laser measuring machines and manual confirmation. This category is available for round brilliant diamonds only.
• Symmetry - inspects the diamond's visual appearance, light reflection and alignment of facets, as seen by the naked eye and under magnification.
• Polish - inspects the smoothed appearance of the diamond's facets as seen under magnification.

For round brilliant diamonds, in addition to the cut categories, an honorary comment called "8 Hearts and 8 Arrows" can be added to each diamond that represents a perfect alignment between the crown's and the pavilion's facets.