Castem Co., Ltd. Sustainable jewelry brand KOHKOH debuts new products in the Kanto region Isetan Shinjuku store

[Castem Co., Ltd.] Sustainable jewelry brand KOHKOH debuts new products in Kanto [Isetan Shinjuku Store] ​ Castem Co., Ltd. Press Release: July 29, 2025 Attention Media Sustainable jewelry brand KOHKOH debuts new products in Kanto [Isetan Shinjuku] New jewelry combining mother of pearl and round pearls KOHKOH, a sustainable jewelry brand developed by precision metal parts manufacturer Castem Co., Ltd. (Fukuyama City, Hiroshima Prefecture, CEO: Takuo Toda), will be showcasing new jewelry at the Isetan Shinjuku Main Building from Wednesday, August 6th to Tuesday, August 12th.
https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-fdd2345439227e460f10c15115d2b63f-715×900.png The brand’s iconic “Light” ring, adorned with blue and white topaz, will be unveiled for the first time in the Kanto region. In addition, the new “Unite” series of earrings, which combine mother-of-pearl and round pearls, will be available for pre-sale at Isetan Shinjuku Main Store. In addition, many new jewelry items using pearls and
mother-of-pearl are available. Please take this opportunity to enjoy the new expressions of pearls and gemstones proposed by KOHKOH. ■Store opening information [Date and time] August 6th (Wed) – August 12th (Tue), 2025 10:00 – 20:00 *Follows the museum’s business hours [Venue] Isetan Shinjuku Main Building 1F = Promotion Space (3-14-1 Shinjuku, Shinjuku-ku, Tokyo 160-0022) URL: http://www.isetan.co.jp Image
URL: https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-56f6f4a47c23545e112a6802e9ce5966-1080×1350.jpg [Exhibition contents]
https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-6d2e69c7926bc08833a9b06d99de8314-1080×1350.jpg These earrings are from the new “Unite” series, which combines mother-of-pearl and round pearls. Pre-sale will be available at Isetan Shinjuku Main Store. An innovative design born from the pursuit of a shape that can only be carved by machine, based on the theme of a modern cameo made from mother-of-pearl. A new piece that combines a cameo with a perfectly round pearl.
https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-dd7a99d94bec4b1502bd45cabb96cd6e-1080×1350.jpg
https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-c2b096eacd5f9e84dd96a560ecbbbaf8-1080×1350.jpg A ring from the “Light” series, symbolizing KOHKOH. A pearl is placed over blue topaz to create a unique beauty. This design was created by Takashi Kojima from an architectural perspective. ■About KOHKOH
https://prcdn.freetls.fastly.net/release_image/35017/233/35017-233-b3de5a7ffea2eda6cb65e48b03826721-1100×500.png KOHKOH is a jewelry brand established in 2023 by CASTEM, a precision metal parts manufacturer. The brand is produced by Takashi Kojima, an internationally active jewelry artist and director of the Japan Jewelry Designers Association. As awareness of “ethical” and “SDGs” spreads throughout society, we place importance on creating
sustainable jewelry that is environmentally friendly. We process “mother shells” that are discarded in large quantities during the pearl making process and breathe new life into jewelry. Furthermore, by utilizing Castem’s 3D modeling technology, they succeeded in cultivating pearls of free shapes that overturn the stereotype that “pearls are round”. They obtained a patent for the technology in 2021. They are challenging themselves to create new art jewelry that makes use of metal part processing technology, and are releasing new works one after another. At “New Jewelry TOKYO 2024”, the largest designer jewelry event in Japan held in Aoyama, Tokyo in 2024, they won both the Best Jewelry Award and the Audience Award. KOHKOH online shop: https://store.kohkoh-jewelry.com/ ■About Castem Using lost wax precision casting and metal injection (MIM) technology, we are primarily engaged in the manufacture and sale of precision parts for various industries, including trains, machine tools, and medical equipment. In 2017, we began planning, manufacturing, and selling products for individual customers. They have been attracting attention by creating a succession of unprecedented anime, manga and
sports-related goods, such as metal objects in the shape of the hands of famous athletes and idols, and Pokéball insect cages. They also operate an origami airplane business and an agricultural business. They are also focusing on “digital casting,” a casting method that uses a wide variety of 3D printers, and on creating color 3D figures. (Castem HP: https://www.castem.co.jp/) ■Contact for this matter Contact: Kamimura E-mail: info@kohkoh-jewelry.com Homepage:
https://kohkoh-jewelry.com/ Official Instagram:
https://www.instagram.com/kohkoh_jewelry/ *This email was sent automatically, so please do not reply.