Masamotoyama Karasu Natural Japanese sharpening stone

"Karasu" (Japanese for "crow") is a type of natural Japanese sharpening stone, named for the characteristic dark, crow-like patterns on the surface of the stone. These stones are particularly valued for their aesthetic appearance and excellent sharpening properties.

Karasu stones are particularly prized for their ability to give blades a high-quality finish and long-lasting sharpness. They are often used to sharpen razors, knives, and carpentry tools. Due to their rarity and aesthetic value, high-quality karasu stones are hard to find and highly prized by collectors and professional sharpeners.