Updates from Kosei.

Our Website Has Been Redesigned

2026-10-01

We have completely refreshed the design and information structure and launched our new corporate website.
We have reorganized our products, services, and contact information to make the site easier to navigate and contacting us more convenient.

We Launched Our Official Instagram Account

2025-10-01

We are pleased to announce the launch of our official Instagram account.
We regularly share an archive of jewelry we have handled and delivered, featuring pieces with a proven track record.
We invite you to explore the story behind these timeless pieces.

Our Website Is Now Live

2025-03

We have launched the Kosei Co., Ltd. website. We look forward to sharing updates here.