![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/bungou_pt_bnr_02_1080x1080_865ae236-c65a-4ca6-b64e-09a7550a2d74.jpg?v=1747649136&width=1080)
![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/8_49d1db1d-abd7-40a0-b340-139f0936804d.jpg?v=1747649136&width=4000)
![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/PA313965_1.jpg?v=1747649136&width=3790)
![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/10_1d9b655f-8821-42b1-9fce-aac63cc53173.jpg?v=1747649136&width=3385)
![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/1_5028e655-4d6d-4a8d-9cb5-125b8dcd8d6e.jpg?v=1747649136&width=4000)
![[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]](http://store.karatz.jp/cdn/shop/files/9_54116403-045b-46d7-aedd-301ccb64561f.jpg?v=1747649136&width=4000)
[Sales End on Monday, June 30th] "Bungo and Alchemist" x KARATZ Collaboration Jewelry Literary Ring [Akutagawa Ryunosuke Model]
"Bungo and Alchemist" and jewelry specialty store KARATZ have collaborated to create authentic jewelry using precious stones.
【Commitment to collaboration jewelry】
◎Uses natural stones, including those directly purchased from around the world by a gem appraiser.
◎Each piece of jewelry is meticulously crafted by skilled artisans in Japan.
【Sales Period】
May 28, 2026 (Thursday) 22:00 - July 31, 2026 (Friday) 23:59
*Sales may end or be suspended once the maximum available quantity is reached.
*Estimated delivery date: Late September 2026
Click here for the special page
~"Bungo and Alchemist" Literary Ring: Ryunosuke Akutagawa Model~ 
Known as one of Akutagawa's masterpieces, "The Cogwheel." The cogwheel, which appears as an important motif in the work, is used as the main design, and smoky quartz, which is consistent with the color of his costume, is used. The Japanese name for smoky quartz, a stone with a mysterious color, is "smoke crystal," which is perfect for Akutagawa, known as a heavy smoker.
The blue ornament on Akutagawa's bolo tie is represented by London Blue Topaz. Its high transparency and vibrant blue color captivate those who see it.
【Product Specifications】
| Material | Silver (SV925 & Rhodium Plating) Platinum (Pt950) |
| Price (incl. tax) | ¥25,800 (Silver) ¥98,000 (Platinum) |
| Gemstones Used |
Smoky Quartz x 2 London Blue Topaz x 1 |
| Size | Sizes 7 to 20 (can be specified in 0.5 size increments) |
【Jewelry Case】
For each piece of jewelry purchased, a special jewelry case will be included.
※Images are for illustration purposes only.
【Ring Purchase Bonus】
For each literary ring purchased, one acrylic stand will be given as a gift. The character for the bonus will correspond to the character of the purchased ring.

【Limited-Time Purchase Bonus】
The Osamu Dazai model, Ryunosuke Akutagawa model, and Kyoka Izumi model do not come with a limited-time purchase bonus.
Bungo and Alchemist × KARATZ Collaboration
View all items
【Important Notes】
・All images are for illustrative purposes only.
・All sizes are approximate. Slight variations may occur.
・Due to the nature of natural stones, there may be differences in color compared to the samples. Please rest assured that each gemstone is carefully inspected to maintain the integrity of the design.
■Regarding Shipping Dates
・Delivery times are estimates only.
・Shipping times may vary due to manufacturing circumstances.
■Regarding Payment Methods
The following payment methods are available at KARATZ STORE:
Credit Card Payment / Convenience Store Payment / Bank Transfer / Rakuten Pay / Apple Pay / Google Pay / PayPay / d Payment / Merpay / Paidy (Post-Payment) / Alipay / AlipayHK / WeChat Pay / PayPal
■Regarding Resizing of Silver Material
Silver material cannot be resized.
■Regarding Resizing of Platinum Material
Platinum material can be resized for a fee.
If you wish to resize after receiving the product, please contact us for consultation. Please include your name and order number for a smoother process.
karatz_ID:90001217
©︎2016 EXNOA LLC
Choose options






![[On sale 8/12, 10 PM] "Limited to 10 stones" Strong Fire Gem Gacha featuring 3mm Benitoite and Blue Zircon, normally 42,800 yen (multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_278d67ff-f62b-4a8b-9e44-16602ef86502.png?v=1786093945&width=2000)
![[On sale August 12th at 10 PM] "Limited to 15 Stones" Diamond Gacha featuring rare butterfly-cut diamonds "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/2026-08-0717.06.55.png?v=1786090036&width=1279)
![[12564014 listed] Madagascar Royal Blue Sapphire 0.559ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7313635_14e21f9a-c659-4e26-98cc-121a6a6526df.jpg?v=1786405650&width=3004)
![[Listed as 12563592] Red Coral 0.908ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P1010942_0ddc060b-5571-4bb3-82db-903a0f6846f0.jpg?v=1784777741&width=4000)
![[Published as 12564055] American Red Beryl 0.239ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061727_7397d8ee-50f1-4d18-895f-81834f48bc37.jpg?v=1786405834&width=3165)
![[Published as 12564054] Kochi Prefecture Coral 8.132ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061786_dbfd5e49-ee7b-485a-84a1-e71f7aec96c4.jpg?v=1786406143&width=3463)

![[Posted on 12563959] Madagascar Padparadscha Sapphire 0.164ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7241965_cec751e0-3766-4ff6-a740-715fc57f7e8e.jpg?v=1786398430&width=2936)
![[12563912 listed] Colombian Pyrite and Mica in Emerald 0.500ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7290484.jpg?v=1785318021&width=4000)



![[#202607 Akihabara Pop-up Store - Currently out on loan] [Listed as 12563392] Tanzanian Red Spinel 0.291ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P6258339_9ab76656-a3f6-484b-99d4-5a2c0a9869bd.jpg?v=1786348136&width=3175)












![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)