Radiant Cut

The Mixed-Cut Master

The radiant cut's story begins before 1977, with South African diamond cutter Basil Watermeyer. As the story is usually told, a pavilion facet on an emerald cut he was working on broke into a half-moon shape. Rather than discard the idea, Watermeyer saw its optical potential and developed what became the Barion Cut — a name combining his own and his wife Marion's.

The Barion was an important early mixed cut: it combined step-cut structure with brilliant-style faceting, bringing some of the sparkle of the round brilliant to square and rectangular outlines and reducing the dark areas those shapes can show. Watermeyer later set down his cutting knowledge in his book Diamond Cutting: A Complete Guide to Diamond Processing, now out of print and sought after by cutters.

In 1977, Henry Grossbard introduced the "Radiant Cut" — a rectangular or square outline with cropped corners and around 70 facets, built on the same mixed-cut idea and designed for wider production. It made the concept accessible to the broader market, and the radiant soon became a favourite for fancy color diamonds.

For Brian Gavin, this history is personal. Trained by his father and grandfather and apprenticed under master cutters Allen Goldstein and Bobby Vancrayfeld, Brian learned his craft in the same South African tradition that produced Watermeyer. In Brian's own account, Watermeyer's insight — that mixed-cut faceting could reduce light leakage in non-round shapes — shaped his later work on the emerald and cushion cuts he went on to patent.

70-Facet Brilliance

A radiant's roughly 70 facets include brilliant-style faceting on both crown and pavilion — kite, triangular, and half-moon shapes arranged to return light from many angles. The cropped corners add facets that a sharp-cornered rectangle would not have.

This high facet count creates lively, complex sparkle with smaller, more numerous flashes than a cushion brilliant. Some describe the radiant's sparkle as "crushed ice" — a shimmering, kaleidoscopic effect.

Radiant vs. Emerald: The Key Distinction

Radiants and emeralds share the same rectangular outline with cropped corners, but their faceting creates completely different optical effects:

• Emerald: Step-cut faceting creates broad, mirror-like flashes — elegant and understated
• Radiant: Brilliant faceting creates intense sparkle and fire — vibrant and eye-catching

The choice between them is aesthetic: sophistication vs. sparkle. For fancy colors where both saturation and brilliance are wanted, the radiant often wins.

The Fancy Color Advantage

The radiant's brilliant faceting mixes light through multiple internal reflections, while its depth allows longer light paths through the colored material. Because GIA grades fancy color face-up, that combination can make color look stronger. It is a popular choice for:

• Fancy Yellow: Alongside the cushion, one of the most popular shapes for strong yellows
• Fancy Pink: Radiant and cushion outlines are common choices for pink rough, helping hold color in smaller stones
• Other fancy colors: Oranges, greens and other rare hues are often cut as radiants for the same reasons

See our fancy color diamonds overview for how color, shape and rarity interact.

Key Proportions

Typical guideline ranges:

• Table: about 60–67%
• Depth: about 62–68%
• Polish/Symmetry: Excellent/Very Good minimum

Our Radiant Standards

• ✓ Expert cut evaluation by Brian Gavin — no GIA cut grade exists for radiants
• ✓ Minimal bowtie verified through ASET and other imaging (radiants can show bowtie in elongated ratios)
• ✓ GIA certified with full documentation
• ✓ Fancy color expertise — we evaluate how the cut affects color saturation
• ✓ Type classification verified for significant stones

Each Shape Tells a Different Story

• Round Brilliant — Maximum brilliance; The Gavin Effect® patented cut
• Emerald Cut — Sophisticated step-cut elegance; patented light performance
• Cushion Cut — Romantic pillow shape; patented Hearts & Arrows precision
• Oval Cut — Elongated brilliance; appears larger for carat weight
• Pear Cut — Elegant teardrop; versatile and flattering
• Princess Cut — Modern square brilliant; exceptional scintillation
• Marquise Cut — Royal heritage; maximizes carat weight appearance
• Old Mine Cut — Historic hand-cut diamonds; antique brilliance

All consultations are complimentary and without obligation. We build long-term relationships based on education, trust, and exceptional service.