The round brilliant cut is a popular diamond shape known for its exceptional sparkle and brilliance. It features 58 facets, which are carefully arranged to maximize light reflection and refraction. This cut is designed to enhance the diamond's natural beauty, making it a favorite choice for engagement rings and other fine jewelry. This cut was developed in the early 20th century by Marcel Tolkowsky, who aimed to create a design that would optimize the diamond's light performance. The round brilliant cut remains the most sought-after shape, accounting for a significant percentage of diamond sales worldwide.