MENTOSEN Wedding Ring Fair 2026/5/22(Fri.)-6/9(Tue.)
MENTOSEN will be holding a wedding ring fair at the MENTOSEN studio in Setagaya, Tokyo, from May 22nd (Fri) to June 9th (Tue), 2026.
During the fair, you can view our original ring collection, as well as fancy-colored and fancy-shaped loose diamonds in-store.
We offer a one-of-a-kind, original wedding ring, custom-made to order using the loose gemstone of your choice.
We have a gift prepared for those who purchase wedding rings during the fair period.
Purchase Bonus
Customers who purchase wedding bands or engagement ring during the fair period will receive a MENTOSEN original origami craft kit as a gift.
You can choose from several options.
How to Order
（MENTOSEN Original Ring Collection）
Discover our original collection: set rings engineered for curved layering, featuring technical stone settings and a soft matte touch.
All MENTOSEN wedding rings are made to order.
1．Consultation (limited to 3 groups per day)
We offer consultations atMENTOSEN Design Studio and Store.
Book your appointment here.
Schedule
a Wedding Ring Appointment
If you have any preferences regarding your budget, the size of the stone (in carats), etc., please let us know in advance when making your reservation to ensure a smooth process.
2．Order / Payment
Once we confirm your payment, your order will be officially confirmed and we will begin producing your jewelry.
3．Making of the jewelry
For the MENTOSEN ring collection, please allow approximately 1.5 to 2 months from the time of order to completion.
For custom orders where you choose from loose stones, the delivery time will differ.Please refer to the custom order section below.
You can pick up your finished ring either in person or have it delivered to your home.
Made-to-Order Engagement Ring
During the bridal fair, we will have a selection of colored diamonds and fancy-cut loose diamonds available.
We offer fully custom-made engagement rings, from stone selection to design.
Fancy color diamonds are diamonds of colors other than white (colorless), such as yellow, brown, and pink.
Fancy cuts refer to various cuts other than the common round brilliant cut, such as marquise cuts, pear-shaped cuts, and emerald cuts.
This is especially recommended for those looking for a unique and original engagement ring design that stands out from the crowd.
You can view the design using a 3D printed model.
1．Loose stone selection and Consultation (limited to 3 groups per day)
You can consult directly with a designer at MENTOSEN Design Studio and Store
Please make a reservation in advance.
Book your appointment here.
Schedule
a Wedding Ring Appointment
Each fancy-colored, fancy-shaped loose stone is unique in its color and shape.
Please note that quantities are limited.
2．Presentation of design and an estimate
You can review the design using a 3D printed model. Since you can actually try on the full-size model, it's easier to visualize the volume and how it will feel to wear.
Please allow 3-4 weeks.
3．Order / Payment
Once we confirm your payment, your order will be officially confirmed and we will begin producing your jewelry.
4．Meking of the jewelry
Your ordered jewelry will be completed in approximately 2 to 2.5 months.
We recommend reaching out at least 3 months before you need your special piece. If you require a shorter delivery date, please contact us as soon as possible.
5．Confirmation of ring size before completion
You can check the ring size before it is completed in platinum or gold.
Depending on the design, some do not require intermediate checks.
Service
1. Inner letters
Free letters engraving
For rings made of gold or platinum, it is possible to have a commemorative letter engraved on the inside of the ring free of charge.We will engrave up to 15 characters free of charge.
Characters that can be used: Uppercase letters, numbers, ".", "&", "to"
Laser engraving (charged)
Up to 18 characters will be engraved with with a laser. There is an optional charge of 3,300 yen (tax included) for this option.
2. Resizing
Ring sizes are available in 0.5 increments.
We offer free size adjustments up to two sizes larger or smaller than your original order, but only once within one month of your initial order.
Our Custom Order Works
