Platinum Winner 2023 – Kawai Tsugite Joint Ring - Architecture Collection
Platinum Winner of the Architecture & Design Collection Awards 2023

Kawai Tsugite Joint Ring

Fashion Design
Jewelry, Watches & Accessories

Architect / Designer:

Toshihiko Suzuki, Yuki Sugihara, Emiliano Cappellini



Design Team:

Toshihiko Suzuki, Yuki Sugihara, Emiliano Cappellini, Naoto Kawai


Yuki Sugihara


We designed a new engagement ring. Two rings with the same parts can be combined in one straight direction and in two right angles. Using a mechanism called Kawaitsugite at the tip, we created two silver rings to express an everlasting love that will never be separated. Once upon a time, Japanese carpenters practiced a traditional construction technique of joining wood together without using nails. Japanese Professor Naoto Kawai applied this mechanism and invented the Kawai Tsugite Joint when he was a student. Production of these engagement rings began in November 2023 after receiving orders from couples getting engaged or married.


ATELIER OPA is an international award-winning design studio in Tokyo, Japan. We provide designs and ideas for our clients based on our interdisciplinary knowledge. We are especially good at compact, mobile, foldable, and straightforward design. We have traveled abroad and printed many books concerning design and architecture from Opa Press. We pursue the beauty of a new era.

We encourage designers and architects to share their best projects with the rest of the world so as to inspire the next generation and gain global recognition.