Radiant Cut

According to GIA grading reports the brilliant cut shape is a type of a diamond manufacture used to describe the rounded rectangular or square stone.

The radiant cut diamond shape was originated over twenty years ago as the pioneer of patented fancy cut diamonds. Nowadays this design is public domain.

Radiant cut diamond is considered to produce more fire and brilliance than a simple emerald cut one. It occurs due to its complete facet pattern applied to both the crown and the pavilion.

On the whole, the most common facet pattern has 62 facets (25 on the crown, 8 on the girdle and 29 on the pavilion). There also exist radiant cut diamonds with 70 facets (25 on the crown, 8 on the girdle and 37 on the pavilion).

While being manufactured, the facets are usually not cut to a point, but polished flat to avoid chipping.

As for the ratio, it has changed over the recent 10 years, when the optimal length to width ratio was about 1.5. This ratio was also the best one for the emerald cut. Nowadays buyers tend to purchase diamonds with length to width ratio of 1.2 or 1.3. At the same time very popular are bright square radiant shapes with the ratio of 1.05 or less.

Radiant cut stones are often used to make center stone for rings with three stones. Popular stones at the sides are trillions, trapezoids, half moons and radiants.

Like other fancy shaped diamonds, radiant-shaped one may have a “bow tie” defect. This is a dark cloud in the center of the diamond resembling the shape of a man`s bow. It occurs when the angles are poorly-proportioned. This defect leads to the lack of brilliance.