Developed in collaboration with Kosuzu Iwao, the DIAMOND G4 redefines the “Diamond” concept with a perfect blend of beauty, precision, and performance.

This fourth-generation model captures Kosuzu’s evolving spirit — confident, bold, and radiant on and off the stage.

At the heart of the DIAMOND GEN 4 lies its signature triple diamond ring motif, inspired by stacked jewelry rings. This design creates a fashionable, layered look, combining artistic beauty with functional precision.

The three diamond rings each feature distinct groove depths and shapes, creating varied grip textures that enhance control and prevent slipping. The stacked-ring structure allows the fingers to naturally recognize grip position, supporting consistent throws and stable release.

Like fine jewelry, the triple ring pattern shines with elegance—a perfect fusion of strength and sophistication.

Accented with vivid red lines, the barrel reflects Kosuzu’s favorite color palette, tying the design back to the vibrant art direction of the DIAMOND series. The red detailing not only enhances visual impact but also embodies energy, confidence, and passion, mirroring the fiery determination of the player herself.

Designed for versatility and balance, this shape offers smooth handling and adaptability, easy to use for both beginners and advanced players.

The entire barrel is carefully arranged to provide grip stability across all positions, supporting a wide range of throwing styles.

The DIAMOND G4 continues the legacy of the DIAMOND series — combining competitive performance with fashion-inspired design. Its sleek black body, bold red accents, and geometric precision embody the brilliance of its name, symbolizing both strength and individuality.

Stylish, versatile, and powerful — the DIAMOND G4 is the next evolution of brilliance, ready to shine in every game.