[2k540 AKI-OKA ARTISAN] (Under the JR Akihabara-Okachimachi overpass) Pop-up store announcement [Thursday, July 30 - Sunday, August 2]
Our next pop-up store will be held in Okachimachi, Tokyo for the first time!
We will offer a wide range of gems, from new arrivals purchased in Hong Kong and loose stones cut from rough stones in Sri Lanka, to familiar gems such as the world's five major gemstones (diamond, ruby, sapphire, emerald, alexandrite), Paraiba tourmaline, and birthstones for each month, as well as rare and unusual stones.
Our beautifully cut loose stones and original jewelry by skilled polishers are also a must-see.
This is a valuable opportunity to actually see and purchase KARATZ gemstones, which are usually only available through our online store!
You can compare multiple stones, look inside with a loupe, and check the fine details.
We can also lend you tools, so please feel free to visit even if you don't have your own. Our staff, who are highly knowledgeable about gemstones, are always on hand, so please feel free to ask any questions you may have.
We also offer "Custom Order Consultations" daily, where you can see a finished image by setting the stone in a frame on the spot.
Please try creating a one-of-a-kind original jewelry piece by choosing your own stone.
We also have various purchase benefits, such as coupons that can be used from the next day's event and a lottery for a free gemstone with purchases of 10,000 yen or more!
Please come and enjoy encountering the proud gemstones that KARATZ has collected from all over the world.
Image: Scene from the Shinjuku Marui Annex event in December 2025
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~2k540 AKI-OKA ARTISAN Pop-up Store~
■Period: July 30 (Thu) - August 2 (Sun), 2026
■Store: 2k540 AKI-OKA ARTISAN Event Space (C-1) (5-9 Ueno, Taito-ku, Tokyo) *Under the elevated railway between Akihabara and Okachimachi Stations on the Yamanote Line ■Products: Gemstones, rare stones, jewelry, custom order consultations ■Business hours: 11:00 - 19:00 *Opening at 13:30 on July 30 (Thu) and closing at 18:00 on August 2 (Sun) |
*Please note that on the first day (July 30), the store will open at 13:30, and on the last day (August 2), it will close at 18:00.
*The event space is located near the Akihabara entrance. If you are coming from Okachimachi Station, please proceed to the very end.
We sincerely look forward to your visit.
~We will update this page regularly with the gemstones to be featured at the pop-up store~
=Table of Contents=
- Jewelry Corner
- Custom Order Consultations
- World's Five Major Gemstones Corner
- Paraiba Tourmaline Special
- Birthstone Corner
- Sanje Cut Corner
- Overseas Purchase Corner
- Specialty & Skilled Cut Corner
- Staff Choice Corner
- Great Value! Semi-Custom Set
- 'Authentic Gemstone Picture Book 3D Stickers'
- About Product Requests from KARATZ STORE
- About Trade-in Services and Auction Consignment
- Pop-up Store Visit & Purchase Benefits
💎Jewelry Corner
We will be bringing a wide variety of meticulously crafted jewelry, including items from Karafuri and those created with original Karatz settings.
You can choose according to your preferred style, from casual to gorgeous.
New creations using Brazilian Paraiba Tourmaline are also being completed one after another!
A basic ring design with melee diamonds set on the sides.
Vibrant Paraiba tourmaline sparkles against the yellow gold metal.
It's perfect for when you want to dress up a little!
Setting name: Legato
Center stone: Brazilian Paraiba Tourmaline
Side stones: Diamonds
Metal: K18YG
This ring uses "Spiritosa" with lovely arabesque-like arms.
The center stone is a cabochon-cut Paraiba tourmaline. Its plump texture creates an endearing look, making it suitable for everyday wear.
Setting name: Spiritosa
Center stone: Brazilian Paraiba Tourmaline
Side stones: Diamonds
Metal: K18YG
This ring uses platinum as the base metal.
Pairing Paraiba tourmaline with a platinum setting creates a refined and crisp look.
The V-shaped arm also has the nice effect of making your fingers look more slender.
Setting name: Andromeda
Center stone: Brazilian Paraiba Tourmaline
Side stones: Diamonds
Metal: Pt950
💎Custom Order Consultation
Our custom order consultations are always very popular. You can create jewelry using gemstones you choose on the day or gemstones you have previously purchased from KARATZ. If you are interested, please speak to a staff member.
You can choose from approximately 40 different design settings (*). You can also customize your piece by changing the side stones to gemstones other than diamonds, or by adding matte or carved finishes. This allows you to create a truly one-of-a-kind original piece of jewelry.
At the pop-up store, you can place the stone in a setting on the spot, allowing you to compare images with multiple settings and let your imagination run wild! *Some settings may have limitations on size and cut.
*We do not accept gemstones purchased from other companies.
▶Click here for precautions and more detailed information.
▶Click here for more information about KARATZ custom orders.
💎World's Five Major Gemstones Corner
This corner features the world's five major gemstones: " Diamond," " Ruby," " Sapphire," " Emerald," which are probably known to everyone, and " Alexandrite," which has the mysterious property of changing color depending on the type of light source.
Please compare the colors, cuts, and sizes.
💎Paraiba Tourmaline Special
Paraiba tourmaline, with its neon blue to green hues, evokes images of tropical seas. It is characterized by its vivid color that leaves a lasting impression once seen.
We plan to feature mainly stones from Brazil and Mozambique, which are the current main production areas.
💎Birthstone Corner
This corner features birthstones for each month.
We will be bringing an expanded selection of birthstones for July and August (*), which are the months of the event.
Even with the same gemstone, the atmosphere changes depending on the color, cut, and size. Also, some gemstones contain unique inclusions or have slightly different properties. You might discover a new charm in a gemstone you thought you knew.
They are also perfect as gifts for family or loved ones. If you are unsure how to search, please feel free to ask our staff for assistance.
*For August birthstones, we will mainly feature peridot and spinel.
Blue Spinel (August birthstone)
Red Spinel (August birthstone)
Pink Spinel (August birthstone)
Orange Spinel (August birthstone)
Chrysoberyl Cat's Eye (February birthstone)
Color-shift Amethyst (February birthstone)
Blue Zircon (Ratanakiri Blue) (December birthstone)
💎Sanje Cut Corner
This is the corner for Sanje, a skilled polishing craftsman from Sri Lanka.
The brilliance of a gemstone is created by the reflection of light. It is said that the quality of the polishing craftsman's skill changes the way it shines.
The brilliance of the gemstones polished by Sanje, who possesses world-class high technical skills, is evident even from a distance. Please see it with your own eyes.
Mica in Quartz
💎Overseas Purchase Corner
This section primarily features gemstones purchased in Hong Kong in mid-June and loose stones polished from rough material in Sri Lanka.
From rare stones to rare quality familiar gems, there's a lot to look forward to!
Axinite (Blue Tint)
💎Specialty & Skilled Cut Corner
This corner features gemstones with expert cuts, crafted by skilled artisans from Japan and abroad.
Many of these cuts not only demonstrate high technical skill but also offer unique originality. They are highly recommended as gifts for those who appreciate rare and distinctive items.
💎Staff Choice Corner
This corner features gemstones recommended by our staff.
There are many charming gemstones even if they are not widely known. You might discover a gemstone you fall in love with at first sight, even if you've never heard its name before.
Also, if you are looking for in-quartz or rare stones, be sure to check out this corner.
💎Great Value! Semi-Custom Set
We have prepared loose stones that allow you to create custom jewelry at a great price!
There are three groups: 0 yen, 5,000 yen, and 10,000 yen for the stone price, and you can create jewelry by paying the stone price of your chosen stone plus the processing fee (frame price).
This means that if you choose a loose stone with a 0 yen stone price, you can create jewelry for only the frame price (processing fee)!
You can choose from about 40 types of frames (*), just like regular custom orders, and we offer a variety of gemstone types including diamonds, alexandrites, and Paraiba tourmalines. We also have cuts by Shimizu Kiseki and limited-edition items.
*Some frames may have limitations on size and cut.
*Processing fees (frame prices) vary depending on the design and metal.
*Loose stones will not be sold alone.
***Pre-sale***
💎"Authentic Gemstone Picture Book 3D Stickers"💎
The latest installment of our popular "Authentic Gemstone Picture Book 3D Stickers" is complete!
It will be available for pre-sale for a limited period of 4 days, ahead of its general release scheduled for mid-August.
● "Volume 2 Birthstones"
This sheet consolidates representative birthstones from January to December. With different cuts arranged side-by-side, you can enjoy a diverse visual experience.
● "Volume 3 Inclusions"
Unlike Volume 1 and Volume 2, this sheet offers a glimpse into the mysterious "world of inclusions" found within gemstones.
This is your chance to get your hands on these two upgraded versions, with an even greater gemstone feel, before their general release. Don't miss out!
***New Release***
💎Gem Gacha💎
The popular Gem Gacha from "KARATZ STORE" makes its debut at the event!
The grand prizes are "Mozambican Paraiba Tourmaline" and "Afghan Hauyne" with a certification report, along with other delightful gems like cat-cut pink tourmaline, Mahenge spinel, Bekily blue garnet, and sphalerite. Whichever you win, you're sure to be happy! ♪
Please try your luck!
Price: 3,500 yen (tax included)
*Limited to one play per person per day
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【Regarding requests to view products sold at KARATZ STORE】
Requests to directly view products listed on KARATZ STORE have now closed. Thank you to everyone who submitted a request for your cooperation.
Even after the deadline, if you consult the "KARATZ STORE Inquiry Desk," we will accommodate you as much as possible.
However, it usually takes 3 to 5 business days to prepare the requested product from the date of your request.Please be aware that we may not be able to prepare the product by your visiting day, or we may have to decline your request depending on the circumstances.
Particularly for inquiries made after the event has started, it is often difficult to respond immediately, making it more likely that we may not be able to accept your request. We ask for your understanding that we cannot always guarantee acceptance.
【Request】
※If there are any changes to your submitted details, such as a change in visit date/time, or if you are unable to visit due to poor health on the day, please contact the Inquiry Desk in advance.
※No advance notice is required for changes to the visit time within the same day.
※Products from "KARATZ STORE" are generally not held for reservation. Even requested items may be sold before you have a chance to view them.
If all requested items are sold out, we will contact you.
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【Implementation of Trade-in Service and Auction Listing Proxy】
A trade-in service and auction listing proxy (Karaoku) will be available exclusively on Saturday, August 1st and Sunday, August 2nd!
If you have jewelry made with precious metals (gold, platinum), please take advantage of this opportunity!
For trade-ins, the payment will be in the form of coupons that can be used at the event, not cash. These can be used for purchasing products or for custom jewelry processing fees, so if you are considering purchasing an item or having custom work done, please use this service.
※There may be a delay in service if the staff member in charge is unavailable.
＜About the Trade-in Service＞
The trade-in service, unlike a cash-based purchase service, is a service that pays you in the form of coupons that can be used at events or the "KARATZ STORE".
In exchange for the condition that you use it for product purchases at KARATZ, we will purchase your items at a higher price than a regular buyback.
＜About Karaoku (Auction Listing Proxy)＞ 
Karaoku is a KARATZ service conducted in partnership with Aucnet Inc., which operates one of the world's largest inter-dealer auctions.
We will consign your jewelry to an auction where professional gem buyers from Japan and overseas gather, allowing for a higher sale price than typical buying services.
※Some gemstones and qualities may not be eligible for auction listing.
▶Click here for more details on Karaoku
For items that are difficult to list in an auction or items you wish to sell, KARATZ can purchase them at a later date.
●Eligible items
Jewelry and precious metals of K9 or higher, Pt750 or higher
※Broken items, severed necklaces, and single earrings are also eligible.
※Loose stones and rough stones are not eligible.
●Trade-in method
If you are interested, please speak to a KARATZ staff member.
●【Reference】Precious Metal Purchase Price Market Rate
＜As of July 2nd (Thursday)＞
Gold: 23,066 yen/g・Platinum: 8,850 yen/g
※Prices are calculated based on the precious metal market rate on the transaction date (fluctuates daily).
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💎Pop-up Store Visit Benefits💎
Answer a short web questionnaire about which sections you were satisfied with, and receive a gemstone gift!
※One gift only. You cannot choose which one.
💎Pop-up Store Purchase Benefits💎
１．SHOP Card with Coupon usable at "KARATZ STORE"
All purchasers will receive a SHOP card with a coupon usable at "KARATZ STORE" and for events from the next day.
２．Gemstone Lottery based on the total purchase amount per transaction
You can draw a gemstone lottery once based on your total purchase amount per transaction❗️
・Purchases of 10,000 yen or more: Gemstone lottery where you can win quartz, birthstones, etc.
・Purchases of 50,000 yen or more: Mid-class gemstone lottery
・Purchases of 100,000 yen or more: High-class gemstone lottery
※In the high-class gemstone lottery, you can win Brazilian Alexandrite, Brazilian Paraiba Tourmaline from Batalha, pink diamonds, and more❗️
There are no losing tickets in any of these lotteries. You are guaranteed to win a gemstone 🎯 Please give it a try!
💎SNS Follow & Post Campaign💎
Customers who post about this event on social media and show the post screen to our staff will receive a "coupon for a discount on custom jewelry orders."
You can use it at the event or on the "KARATZ STORE" (online shop).
※One use per person. Cannot be combined with other coupons.
【How to participate】
① Follow KARATZ official Instagram or X
② Post with the hashtag "#2607KARATZpopup"
※Instagram story posts are not eligible.
③ Show the post screen to staff at the venue.
💎Photo Spot Corner💎
A "Photo Spot Corner" will be specially set up in the venue where you can photograph the loose gemstones and jewelry you purchased, or your gacha winnings.
Please take photos and share them on social media!
💎Custom Order Consultation
You can place a custom order for rings, pendants, etc., using the gemstones you choose on the day.
This service also applies to loose stones previously purchased from KARATZ or Shimizukiseki. If you are considering this, please bring them with you.
You can choose from approximately 40 design settings (*). You can also customize by changing side stones to color diamonds, Paraiba tourmaline, alexandrite, etc., or by adding matte finish or engraving. Visualize your design by placing it on the setting!
※Some settings may have limited sizes and cuts.
※We do not accept gemstones purchased from other companies.
▶Click here for more details on KARATZ custom orders
【Important Notes when bringing loose stones】
If you wish to place a custom order using loose stones previously purchased from KARATZ or Shimizukiseki, please be sure to read and agree to the following notes before bringing them.
◎Regarding products previously purchased from KARATZ
Please be sure to bring proof of past purchase from KARATZ.
＜Examples＞
●KARATZ Quality Guarantee Certificate (old KARATZ Appraisal Report)
●Proof of purchase history (e.g., screenshot of purchase screen)
●Sticker attached to the product at an event, etc.
When customizing a product purchased from us, in the unlikely event that the stone breaks during processing, we will provide a full refund or replacement product (*).
*Some gemstones and conditions may not be eligible for compensation.
For products for which past purchase from our company cannot be confirmed, we may decline to accept the order due to difficulties in providing compensation.
Please note that while it is possible to create items from free novelty gifts distributed in the past, we cannot provide compensation if they break. Thank you for your understanding.
◎Regarding products directly purchased from Shimizukiseki
For products directly purchased from Shimizukiseki in the past, we cannot provide compensation if they break during processing.
We ask that only those who agree to this condition bring their items.
