Aji Project Aji Stone Coaster

AJI STONE · TAKAMATSU, KAGAWA

A Rare Japanese Granite Quarried Only in Takamatsu, Kagawa

Aji Stone is a rare and highly esteemed granite found exclusively in the northeastern region of Takamatsu City, Kagawa Prefecture, Japan. Known for its exceptional density and refined grain, this stone is prized for both its durability and natural beauty.

With a Mohs hardness rating of 7 — comparable to quartz — Aji Stone surpasses most decorative stones in strength (for comparison, marble ranks at 4). Its tightly bonded fine particles enable precise and delicate craftsmanship. Moreover, its low moisture absorption makes it highly resistant to weathering, ensuring long-lasting quality.

Hand-Finished by Stone Artisans in Kagawa

Due to the stone's remarkable hardness and density, working with Aji Stone requires a high level of expertise. In its place of origin, specialized artisans handle each stage of the process — from quarrying and cutting to polishing, engraving, and shaping. Their generational craftsmanship brings out the full character of the stone, transforming it into a piece of functional art.

A Circular Stone Coaster with Graphic Surface Designs

This granite coaster pairs a simple circular form with a choice of Grid, Stripe, or Plain surfaces. The engraved patterns introduce a precise graphic contrast to the natural grain of Aji Stone, while the round silhouette keeps the design calm and versatile. It can be used for glasses and cups, small items, or as a compact plate or planter base.

meet the artisans

AJI PROJECT

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