#Japan #Tokyo #Diamonds #Engagement Rings #Cat #atelier ST

Atelier ST,CAT to Open New Engagement Ring Boutique

Atelier ST,CAT, a rising name in the wedding jewelry scene, is set to unveil a new store specializing in engagement rings and diamonds on June 27, 2026, in Yoyogi Uehara. This new venture comes on the heels of the brand's impressive growth since its transition to a bridal-focused business in 2023, during which it experienced a staggering 25-fold increase in profit over just three years. The decision to open an independent store stems from the mounting demand for engagement rings and customized wedding bands.

Expanding Presence in Bridal Jewelry

Located just a three-minute walk from its main store in Shibuya, the new boutique – named -u- atelier ST,CAT – promises a personalized experience for customers. By operating as a specialized store, Atelier ST,CAT aims to foster deeper connections with customers and present unique ring proposals tailored to individual life stories.

Currently, the brand operates a single location but is committed to expanding its presence in the bridal sector, emphasizing in-store experiences while laying the groundwork for a multi-store strategy to drive further growth.

New Diamond Offerings

At the new location, customers can explore an array of engagement ring designs, featuring both natural and lab-grown diamonds. The brand takes pride in its commitment to high-quality craftsmanship and offers a diverse selection of styles, from large, fashionable pieces to subtle everyday designs. Each ring is handcrafted in the attached atelier, ensuring that every detail, from diamond settings to the ring's finish, is custom-fitted per customer specifications.

A Sophisticated Space Designed by MILESTONE

The new boutique's design, crafted by the renowned architectural firm MILESTONE, mirrors the ambiance of popular eateries like Kabi and AC HOUSE. Customers will be welcomed into a stylish space that juxtaposes organic curves with the industrial elegance of hand-treated iron, creating a soothing environment in which to make selections. Inside, curious designs reminiscent of caves or cosmic elements will stimulate the imagination, while a circular window provides a glimpse into the atelier where the magic happens.

Fostering Timeless Relationships

Atelier ST,CAT is built upon the belief that jewelry should evolve with the wearer's life journey. The brand's approach is characterized by a blend of traditional craftsmanship and contemporary design, centered around creating personalized engagement and wedding rings that reflect the couple's unique story. Established in 2014 by former fashion editor Seiko Hayashi, the brand shifted its focus exclusively to bridal jewelry in 2023. The hand-crafted quality of their pieces is intended to embody the 'unwritten potential of a couple's life together'.

As we approach the store's opening, Atelier ST,CAT anticipates the arrival of a new creative director, Akiko Kano, in spring 2026, who will bring fresh perspectives and strengthen the brand's growth through creative and managerial separation.

Messages from the Leadership

Akiko Kano, the new Creative Director, expresses enthusiasm about making the ring selection process enjoyable for couples, recognizing that it can often feel overwhelming. 'Our goal is to create a space where selecting a ring becomes a memorable experience that reflects the love story you've built together,' she notes. On the other hand, Seiko Hayashi, the CEO, emphasizes the brand's commitment to innovation, stating, 'With our incorporation of lab-grown diamonds and diverse designs, we aim to craft engagement rings that resonate with the sentiment of finally finding the one.'

New Store Details

• - -u- atelier ST,CAT

1-25-3 Uehara, Shibuya
First Floor
Open: 10 AM - 6 PM, Closed on Tuesdays
Reservations for weekends begin on June 10th at 12 PM, and free walk-ins start in July.

• - atelier ST,CAT (existing store)

1-32-3 CABO Uehara 205, Shibuya
Open: 10 AM - 6 PM, Closed on Tuesdays, Reservation required

Company Overview

The company behind Atelier ST,CAT is B.H. Long Co., Ltd.
CEO: Seiko Hayashi
Website: st-cat.com
Email: [email protected]
Instagram: @atelierstcat

For inquiries regarding this article, please contact the public relations team at Atelier ST,CAT at [email protected].