[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 have a wide selection of gemstones, from new arrivals sourced in Hong Kong and loose stones cut from rough in Sri Lanka, to the world's five major gemstones (diamond, ruby, sapphire, emerald, and alexandrite), Paraiba tourmaline, birthstones for each month, and other rare and unusual stones. You won't want to miss our beautiful loose stones cut by skilled polishers and original jewelry.
This is a rare opportunity to see and purchase KARATZ gemstones, which are normally only available online! You can compare multiple stones, peer 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, with extensive knowledge of gemstones, will be on hand to answer any questions you may have.
"Custom order consultations" are also held daily, where you can place stones in settings on the spot to get an idea of the finished product. Please try creating your own unique piece of jewelry, starting with selecting the stone.
We also have various purchase benefits, such as coupons that can be used at the event from the next day and a gemstone goodie lottery for purchases over 10,000 yen!
We look forward to welcoming you and enjoying the encounter with the proud gemstones KARATZ has collected from all over the world.
Image: Shinjuku Marui Annex, December 2025
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～2k540 AKI-OKA ARTISAN Pop-up Store～
■Period: July 30 (Thu) 13:30 - August 2 (Sun) 18:00, 2026
■Location: 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 ■Hours: 11:00 - 19:00 *July 30 (Thu) opens at 13:30, August 2 (Sun) closes at 18:00 |
*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 look forward to your visit.
～Gemstones to be showcased at the pop-up store will be updated on this page～
= Table of Contents =
- Jewelry Corner
- Custom Order Consultation
- World's Five Major Gemstones Corner
- Paraiba Tourmaline Special Feature
- Birthstone Corner
- Sanje's Cut Corner
- Overseas Purchase Corner
- Specialty & Skillful Cut Corner
- Staff's Choice Corner
- Great Value! Semi-Custom Set
- Product Request for KARATZ STORE Items
- Regarding the Implementation of Auction Consignment and Trade-in Services
- Pop-up Store Visit & Purchase Benefits
💎Jewelry Corner
We will be bringing a wide variety of jewelry, including colorful items and pieces created with KARATZ original settings, all crafted with meticulous attention to detail. You can choose from styles ranging from casual to gorgeous to suit your preference.
New creations using Brazilian Paraiba tourmaline are also being completed one after another!
A basic ring design with melee diamonds lined up on the sides. The vivid Paraiba tourmaline sparkles against the yellow gold metal. It's perfect for when you want to dress up a bit!
Setting Name: Legato
Center Stone: Brazilian Paraiba Tourmaline
Side Stones: Diamonds
Metal: K18YG
This ring uses "Spiritosa," with a lovely arabesque-like arm. The center stone is a cabochon-cut Paraiba tourmaline, whose plump texture adds a charming touch. It would look great with everyday styles.
Setting Name: Spiritosa
Center Stone: Brazilian Paraiba Tourmaline
Side Stones: Diamonds
Metal: K18YG
This ring uses platinum for the metal. Pairing Paraiba tourmaline with a platinum setting creates a refined and crisp feel. The V-shaped arm also has the nice benefit of making your fingers appear slimmer.
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 select on the day or gemstones you've purchased from KARATZ in the past. If you're interested, please speak to a staff member.
You can choose from approximately 40 design settings (*). Customization is also possible, such as changing side stones to gemstones other than diamonds, or applying matte or engraved finishes. This allows you to create truly one-of-a-kind original jewelry. At the pop-up store, you can place the stone in the setting on the spot to compare how it looks with different settings, which helps in visualizing your design! *Some settings have size and cut limitations.
*We do not accept gemstones purchased from other companies.
▶Click here for important notes and more detailed information
▶Click here for more details about KARATZ custom orders
💎World's Five Major Gemstones Corner
This corner features the world's five major gemstones: the widely known "Diamond," "Ruby," "Sapphire," and "Emerald," along with "Alexandrite," which possesses the mysterious property of changing color depending on the light source. Please compare the colors, cuts, and sizes.
💎Paraiba Tourmaline Special Feature
Paraiba tourmaline, with its neon-like blue to green hues, evokes the image of a tropical sea. Its vivid color is truly captivating. We plan to showcase primarily stones from Brazil and Mozambique, which are the main current sources.
💎Birthstone Corner
This corner features birthstones for each month.
We will be expanding our selection of birthstones for July and August (*), the months in which the event is held. Even for the same gemstone, the atmosphere can change depending on the color, cut, and size. Some gemstones also contain unique inclusions or have slightly different varieties. You might discover a new charm in a gemstone you already know. They are also perfect for gifts for family and loved ones. If you need help finding something, please feel free to ask our staff. *For August birthstones, we will primarily feature peridot and spinel.
Blue Spinel (August Birthstone)
Red Spinel (August Birthstone)
Pink Spinel (August Birthstone)
Chrysoberyl Cat's Eye (February Birthstone)
Color-shift Amethyst (February Birthstone)
Blue Zircon (Ratanakiri Blue) (December Birthstone)
💎Sanje's Cut Corner
This is the corner for Sanje, a skilled polisher from Sri Lanka.
The brilliance of a gemstone is created by the reflection of light. The quality of this brilliance is said to vary depending on the skill of the polisher. The sparkle of gemstones polished by Sanje, who possesses world-class technical skills, is evident even from a distance. Please come and see it for yourself.
Mica in Quartz
💎Overseas Purchase Corner
This corner features gemstones purchased in Hong Kong in mid-June, as well as loose stones polished from rough in Sri Lanka. From rare stones to rare quality familiar gemstones, there's something for everyone!
Axinite (Blue Tint)
💎Specialty & Skillful Cut Corner
This corner features skillfully cut gemstones crafted by master artisans from Japan and around the world. In addition to their high level of technical skill, many of these cuts offer unique originality. They are also recommended as gifts for those who appreciate rare and unusual items.
💎Staff's Choice Corner
This corner features gemstones recommended by our staff.
Even if they are not widely known, there are many charming gemstones. You might even find a gemstone you fall in love with at first sight, even if you've never heard its name before. Also, if you're looking for included quartz or rare stones, be sure to check this corner.
💎Great Value! Semi-Custom Set
We've prepared loose stones that allow you to create custom-made jewelry at a great value!
There are three groups of stones: 0 yen, 5,000 yen, and 10,000 yen. You can create jewelry by paying the processing fee (setting price) plus the price of the stone you choose. This means that if you choose a 0 yen loose stone, you can create jewelry for just the setting price (processing fee)! You can choose from approximately 40 types of settings (*), the same as for regular custom orders, and we offer a variety of gemstones including diamonds, alexandrite, and Paraiba tourmaline. We also have cuts by Shimizu Kiseki and limited-edition items for the event.
*Some settings have size and cut limitations.
*Processing fees (setting prices) vary depending on the design and metal.
*Loose stones will not be sold separately.
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【Regarding Product Requests for Items Sold on KARATZ STORE】
The products sold at the pop-up store will primarily be carefully selected for the event, and items currently available on the KARATZ STORE may often not be present at the venue.
If you wish to see and purchase items currently sold on the KARATZ STORE in person, please confirm the precautions and submit your request via the form below by Wednesday, July 22.
▼To the Product Request Application Form▼
*After the deadline, the form will no longer be accessible.
*We accept requests for up to 3 items per person.
*In principle, we do not hold "KARATZ STORE" products for reservations. Even for requested items, there is a possibility that they may be sold before you have a chance to view them. Please be aware of this in advance when submitting your request.
*Requests are not required for event sales items introduced on this page or social media. Please visit the venue directly.
*Even if the deadline has passed, if you consult us via the "KARATZ STORE Inquiry Desk," we will accommodate you as much as possible.
However, please note that product preparation usually takes 3-5 business days, so depending on when you submit your request, we may not be able to prepare the product by your visiting date, or we may have to decline your request depending on the circumstances. Inquiries made after the event has started, in particular, may often be difficult to handle immediately, and the likelihood of us being unable to accept them increases. We kindly ask for your understanding and cooperation in advance.
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【Regarding the Implementation of Trade-in Services and Auction Consignment】
Trade-in services and auction consignment (KARATZ Auction) will be available exclusively from August 1 (Sat) to August 2 (Sun)! If you have jewelry made with precious metals (gold, platinum), please bring them in during this opportunity!
In the case of trade-ins, payment will be in the form of coupons that can be used at the event, not cash. These coupons can be used for product purchases or processing fees for custom-made jewelry, so please take advantage of this if you are considering purchasing a product or having custom jewelry made. *Please note that if the staff in charge is unavailable, it may take some time to process your request.
＜About Karaoku (Auction Consignment Service)＞ 
Karaoku is a KARATZ service provided in partnership with Aucnet Inc., which operates one of the world's largest B2B auctions.
We will consign your jewelry to auctions attended by professional gem buyers from Japan and overseas, which can lead to a higher sale price than typical buying services.
*Some gems and qualities may not be eligible for auction consignment.
▶Click here for more details about Karaoku
Items that are difficult to auction or items you wish to sell can also be purchased by KARATZ at a later date.
●Eligible Items
Jewelry and precious metals of K9 or higher, Pt750 or higher
*Broken items, broken 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 Thursday, July 2nd＞
Gold: 23,066 yen/g・Platinum: 8,850 yen/g
*Prices are calculated based on the precious metal market rate on the transaction day (which fluctuates daily).
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💎Pop-up Store Visit Benefits💎
Receive a free gem by answering a short web survey about which corner you were satisfied with!
*One gem per person. You cannot choose the type.
💎Pop-up Store Purchase Benefits💎
1. SHOP Card with a coupon usable at "KARATZ STORE"
All purchasers will receive a SHOP card with a coupon that can be used at "KARATZ STORE" and at events from the following day.
2. Gem lottery based on the purchase amount per transaction
You can draw one gem lottery for each purchase amount per transaction❗️
10,000 yen or more... Gem lottery where you can win diamonds, sapphires, etc.
50,000 yen or more... Mid-class gem lottery
100,000 yen or more... High-class gem lottery
*In the high-class gem lottery, you can win Brazilian Alexandrite, Brazilian Batalha Paraiba Tourmaline, pink diamonds, and more❗️
There are no losing tickets in any of the lotteries. You are guaranteed to win a gem 🎯 Please give it a try!
💎Custom Order Consultation
You can place a custom order on the spot to create rings, pendants, etc. using the gems you choose that day.
Loose stones purchased previously at KARATZ or from Shimizu Kiseki are also eligible. If you are considering this, please bring them with you.
You can choose from approximately 40 design settings (*). You can also customize them by changing side stones to colored diamonds, Paraiba tourmalines, alexandrites, etc., or by adding matte or carved finishes. Please try placing them in a setting to visualize your design!
*Some settings have limited sizes and cuts.
*We do not accept gems purchased from other companies.
▶Click here for more details about KARATZ custom orders
[Important notes when bringing loose stones]
If you wish to make a custom order with loose stones purchased previously from KARATZ or Shimizu Kiseki, please be sure to read and agree to the following important notes before bringing them.
◎Regarding items purchased previously from KARATZ
Please be sure to bring proof of past purchase from KARATZ.
＜Examples＞
●KARATZ quality guarantee (old KARATZ appraisal report)
●Proof of product purchase history (e.g., screenshot of purchase screen)
●Sticker attached to the product at the event, etc.
When customizing products purchased from us into bespoke jewelry, in the unlikely event that a stone breaks during processing, we offer full compensation in the form of a refund or a replacement item(*).
*Some gem types and conditions may not be eligible for compensation.
For products that cannot be confirmed as having been purchased from us previously, compensation may be difficult, and we may refuse to accept the order.
Please note that items previously distributed as free gifts can be used for creation, but we cannot compensate if they break. Thank you for your understanding.
◎Regarding items purchased directly from Shimizu Kiseki
For items purchased directly from Shimizu Kiseki in the past, we cannot provide compensation if they break during processing.
Please only bring items if you understand and agree to this.
