Raden Tachi

Raden tachi (mother-of-pearl inlaid sword) is a general term for decorative swords whose mountings are embellished with the raden technique—a method in which the iridescent nacre layer found on the inner surface of shells such as abalone, window-pane oyster, and white-lipped pearl oyster is thinly shaved and inlaid onto lacquered, gilt, or silvered grounds to create decorative patterns. In the history of Japanese craftsmanship, the raden tachi form a category of the highest-quality crafted swords produced from the late Heian period through the Kamakura period as votive offerings for the nobility, samurai, shrines, and temples, and multiple extant examples are currently designated as National Treasures or Important Cultural Properties.

Among representative National Treasure raden tachi, those held by Kasuga Taisha, Itsukushima Shrine, Tsurugaoka Hachiman Shrine, and the Tokyo National Museum are particularly renowned. All of these are comprehensive works of craftsmanship combining gold, silver, lacquer, mother-of-pearl inlay, and metal fittings (openwork gilt-bronze tsuba, edge fittings, kashira, and others), and they are positioned as the most important examples in both sword history and the history of Japanese craftsmanship as embodiments of the finest Heian-period craftsmanship.

The blade portion of raden tachi is often the work of swordsmiths from the Ko-Bizen, Yamato, and other schools of the Koto period, displaying the Heian style with pronounced curve. The point is of the small type; the blade width is somewhat narrow with deep waist curve, presenting an overall elegant, slender tachi form. The mounting design is primarily composed of auspicious motifs reflecting Heian court aesthetics—such as phoenixes, arabesques, pines, chrysanthemums, and grapevines—with the iridescent glow characteristic of mother-of-pearl displaying distinctly different beauty under both artificial and natural light.