Aji Stone Coaster – Handcrafted in Japan from the World's Finest Granite

What is Aji Stone?

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.

Handcrafted by Japanese Artisans

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.

○Specifications

• Material: Aji stone (a kind of granite) 
• Size Mitsude: w80*d95*h5 mm / Mon Hyotan: w100*d150*h6 mm / Mon Nejiri: w145*d140*h6 mm
• Weight: 100 g each

○Shipping

• We will ship within a month maximum (if not in stock and will be made to order).
  If in stock, we will ship within a week.
• Shipping fee is included in the product price. 
• Since the products are processed from natural stone, each one is different in shape. Please be aware that the product you receive may differ from the product image shown on the website.

Behind the Scenes Read story  See all items of AJI PROJECT