Blue Agate — cool, banded, quietly composed.
A calm and balanced stone, with natural banding in shades of blue. A seal for those who prefer presence without weight.
Why this material
- Soft blue tones with naturally drawn banding — no two pieces alike.
- Long valued as a stone of calm, clarity, and composure.
- Hard, dense, and resistant to wear — a sharp impression that lasts.
A Case as Crafted as the Seal Within.
Made exclusively for us from genuine kimono fabric, each case is patterned with a traditional Japanese motif — animals, flowers, flowing water — a small work of art that honours the seal it holds.
Who it’s for
Well suited to professionals and creatives marking a new chapter, and as a memorable gift for milestones, weddings, and new homes.
Blue Agate
KAMAKURA SIGNET — The Precious Stone Collection
precision-engraved in our Kamakura atelier — a workshop that has practised the art of the seal since 1898, through four generations of the Tsukino family. Each seal is precision-engraved by masters holding Japan’s First-Class National Certification in seal engraving — a distinction shared by fewer than one hundred artisans in the country — in the Tsukino Kissotai script that exists in no other workshop. Among the rarest materials we offer in a personal seal.
A one-of-a-kind work, carved once for a single name. Not a stamp to be used and discarded — an object to be owned, and passed on.

















