Degree and regularity in shape and placement of facets, how well they align and relate to each other. Symmetry is very important to the life in a diamond, especially the brilliance; it affects how light is reflected and refracted in a diamond. Symmetrical round brilliant cut diamonds often display hearts & arrows.
Step Cut
Star Facets
Triangle shaped facets on a round brilliant cut diamond surrounding the table facet. When viewed as a whole, they resemble an 8-point star.
Single-Cut
Simulant
Any material that is meant to look like or imitate a diamond, but is not a natural or synthetic diamond. Examples of diamond simulants: cubic zirconia, moissanite, and glass.
Shape
Scintillation
Saturation
Intensity and purity of colour in a diamond. Both cape series diamonds and fancy shape diamonds are graded on a scale of increasing saturation, in addition to hue and tone.
Round Brilliant Cut
Diamond cut or shaped into a circular outline or circumference, with a cone-shaped pavilion. The standard round brilliant diamond has 57 or 58 facets, and is the most popular style of cutting.
Rough Diamond
Diamond in its natural state, exactly as it is found in the earth, prior to undergoing cutting, polishing, or alteration of any kind. See DCLA: Rough Diamond Services.