Kofun Period (ca. 3rd century–538) Bracelet, Kofun period (ca. 3rd century–538), 4th century Japan Steatite This irregular disk with smooth radial fluting is a fine example of a type of carved stone object found in the keyhole-shaped burial mounds of central Japan from the fourth and fifth centuries. Works in this shape are called sharinseki (carriage-wheel stones) and are sometimes identif..