Anatomy of a Diamond - The Cut

Cut is the factor that fuels a diamond’s fire, sparkle and brilliance.

"The cut of any diamond has three attributes: brilliance (the total light reflected from a diamond), fire (the dispersion of light into the colors of the spectrum), and scintillation (the flashes of light, or sparkle, when a diamond is moved)."

via Gemological  Institute of America (gia.edu)

Diamond Cut Guide

via Brilliance