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Adult Sebonstar (Sebonstar x KARATZ collaboration jewelry)

About the Pop-up Store

KARATZ Pop-up at 2k540 AKI-OKA ARTISAN (under the JR Akihabara-Okachimachi elevated tracks)
Period: July 30, 2026 (Thu) 13:30 to August 2 (Sun) 18:00
Location: 2k540 AKI-OKA ARTISAN (under the JR Akihabara-Okachimachi elevated tracks)
Business Hours: 11:00 - 19:00
*Opening at 13:30 on July 30 (Thu), closing at 18:00 on August 2 (Sun)

● Items available
・Exhibition and pre-order acceptance for the new "Swan Tiara" model from "Adult Sebonstar"
*This product is made-to-order.

● Pop-up store exclusive benefits
Customers who order the "Swan Tiara" will receive one entry into the "Gemstone Lottery," where a gemstone is guaranteed. Customers who order online can also participate in the Gemstone Lottery by presenting their order screen at the pop-up store venue during the event period.

About Online Orders

Sales Period: July 30, 2026 (Thu) 12:00 to August 31 (Mon) 23:59
*Sales may end or be suspended once the maximum number of items available for sale is reached.
*Estimated delivery date: Around late December 2026. This may be subject to change.


KARATZ Custom Made

Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZ's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.