Gyokusendo (玉川堂)
Tsuiki copperware from Tsubame — hand-raised vessels shaped by hammer and time.
Gyokusendo is a tsuiki (hammer-raised) copperware workshop based in Tsubame City, Niigata. Founded in 1816, the studio has continued to lead the craft of shaping a single sheet of copper into kettles, teaware, cups, and everyday objects. The Tsubame-Sanjo region is widely known for metalworking, and tsuiki copperware has been designated as an intangible cultural property by Niigata Prefecture. At Gyokusendo, the tradition is carried into the present through functional pieces designed to be used, cared for, and kept for the long term.
PROFILE Company & Brand Story
In snowy Niigata, the sound of hammers has echoed through Gyokusendo for generations. Founded in 1816 in Tsubame, the studio has devoted itself to tsuiki copperware — vessels raised by hand from a single sheet of copper. The work is deeply physical: the rhythm of hammering, the glow of the furnace, and the moment copper softens again all remain, quietly, in the finished surface.
One of the defining aspects of tsuiki is the way artisans hammer to shrink the copper, guiding it into a three-dimensional form. A single kettle can require dozens of specialized tools, and the copper must be annealed repeatedly as it hardens. Through this repetition, the form becomes precise, the texture intentional, and the object both functional and sculptural.
Kettles sit at the heart of Gyokusendo's identity. From classic forms to the seamless "Kuchi-uchidashi" spout — formed from the same copper sheet without any join — the studio showcases extraordinary technical range. Beyond kettles, Gyokusendo produces teaware, cups, coffee tools, and home accessories, where the craft is meant to be touched and used rather than kept behind glass.
Colour is another signature. Oxidizing and patination methods, tinning and baking, polishing and re-oxidizing — small changes in temperature and timing can shift the final hue dramatically. Because each piece is coloured individually, even works under the same colour name will show gentle variations, giving copperware a sense of living personality. Gyokusendo supports long-term ownership with repair services and Open Factory studio tours in Tsubame, plus stores in Ginza (GINZA SIX 4F) and at Gyokusendo Kogai in Nishi-Azabu.
Hand-Raised from a Single Copper Sheet
Tsuiki is built around "hammer and raise." Gyokusendo artisans shape copper by hammering to shrink — not stretch — using dozens of hammers and anvil stakes, repeating annealing as the metal hardens. The finished form is guided by the artisan's mental image, refined through countless strikes and careful planishing.
Seamless Spouts — "Kuchi-uchidashi" Kettles
"Kuchi-uchidashi" refers to forming the spout seamlessly from the same sheet of copper as the kettle body. The continuous flowing line from body to spout highlights the studio's mastery of tsuiki — and traces directly back to Gyokusendo's origins as a kettle maker in 1816.
Individual Colouring Across Seven Generations
After shaping, pieces are individually coloured using patination and oxidizing methods. From classic reds to iridescent blues created through tinning and baking, the surface comes alive through subtle control of heat, chemistry, and hand polishing — giving each piece its own character.
Open Factory Tours, Stores & Repair Support
The Tsubame workshop runs Open Factory tours (free, reservation preferred) where visitors watch artisans at work and handle finished pieces afterward. Stores in Ginza (GINZA SIX 4F) and Gyokusendo Kogai bring tsuiki to Tokyo. Repair inquiries accepted — keeping copperware in active use for generations.
PRODUCTS Featured Products & Services
Gyokusendo Copper Kettle — Hand-Raised Tsuiki, Made in Tsubame
Hand-raised copper kettles from the 1816-founded Gyokusendo workshop. Traditional tsuiki technique, individually coloured, seamless construction. A lifetime object that develops richer patina with daily use. Available through the official Gyokusendo online shop.
View DetailsGyokusendo Copper Teaware & Coffee Tools — Tsuiki, Made in Tsubame
Copper teapots, cups, coffee drippers, and home accessories from Gyokusendo. Each piece is individually hammer-raised and coloured. Available in classic and modern forms — functional art for the daily ritual of tea or coffee.
View DetailsMEDIA Media, Awards & Initiatives
- Tsuiki copperware designated as an intangible cultural property by Niigata Prefecture. Gyokusendo operates stores at GINZA SIX 4F (Tokyo) and Gyokusendo Kogai (Nishi-Azabu, Tokyo), and the Tsubame workshop is open for public factory tours.