[Available until 11/13 (Fri)] "Assassination Classroom" x KARATZ Collaboration: Koro-sensei Model Ring

The TV anime "Assassination Classroom" has collaborated with jewelry specialist KARATZ to create authentic jewelry using gemstones.

Click here for the special page


【Dedication to the Collaboration Jewelry】
・We use high-quality gemstones carefully selected by expert gemstone buyers.
・The jewelry is made of SV925 with gold plating to ensure long-lasting beauty.
・Each piece is meticulously crafted by skilled domestic artisans.

Sales Period: Until Friday, November 13, 2026
※Sales may end or be temporarily suspended once the available quantity is reached.

Estimated Delivery Date:
Scheduled for mid-December 2026
※As this is a made-to-order item, the timing may vary depending on production status.


-Koro-sensei Model Ring-
A charming Koro-sensei model ring featuring a gemstone at its center—a clear lemon quartz exquisitely carved to resemble Koro-sensei's face.

【Product Specifications】

【Care Instructions】
・Gently wipe off sweat and dirt with a soft cloth; if necessary, wash lightly in water or lukewarm water and let dry.
・When using a microfiber cloth, be careful as any hard debris or sand attached to the cloth may cause scratches.
・Avoid using abrasive polishing cloths, silver-specific cleaners, or cleaning liquids, as they can cause the plating to peel off.

【Important Notes】
・All images are for illustrative purposes only.
・All sizes are approximate and may vary slightly.
・Due to the nature of natural stones, there may be slight differences in color compared to the sample. Please rest assured that each gemstone is individually inspected to ensure the product's image is maintained.

■ About Shipping Dates
・Delivery dates are estimates only.
・Delivery times may shift due to production circumstances.

■ About Payment Methods
The following payment methods are available at the KARATZ Store:
Credit card / Convenience store payment / Bank transfer / Apple Pay / Google Pay / PayPay / d-Barai / Merpay / Paidy / Alipay / AlipayHK / WeChat Pay

■ About Resizing Silver Items
Silver material items cannot be resized.

karatz_ID:ansatsu_40000326

©Yusei Matsui/SHUEISHA, Assassination Classroom Committee 2025