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Charm Amulet Cross

White gold, Diamonds

€348,95
€348,95
Sold Out
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Made for all T-Rings: insert, lock, transform your look.

Delivery in 2–5 business days.

SIZE GUIDE

Guessing the size? Not necessary. Got it wrong? No worries.

Size Guide for Surprise Gifts

Not sure about the size? We’ve got you covered — the surprise stays a surprise.

KOTAOSTA is all about emotions.
But if you want the ring to fit perfectly from the start, here are 4 simple and discreet ways to measure your loved one’s finger size — without spoiling the surprise.

1. Scan a ring using an app

If you have access to a ring she already wears:

📲 Fast, easy, accurate — and 100% stealth

2. Place her finger on your phone screen

If you don’t have a ring but can gently compare her finger:

  • Open a sizing app or size chart on your phone
  • While she’s asleep or resting, carefully place her finger on the screen
  • Align her finger with the circles to estimate the size
  • Or take a photo of her finger and send it to us — we’ll help!

💤 Works great at night — just a little light and finesse required

3. Ask someone close

A sister, friend, or mother might already know — or can help find out:

  • Have them casually try on rings together at a store
  • Ask them to take a photo of her hand with a ring
  • Or ask directly — without giving away the surprise

💡 Your secret allies can make the difference

4. Print out our sizing template

  • Download and print our PDF ring size chart
  • Place her ring on the circles and find the closest match
  • Or use the included paper strip to measure her finger discreetly

👉 Download the Ring Size Template (PDF)

🖨️ Simple and accurate — just follow the instructions carefully

Still not sure?

KOTAOSTA rings are made to adapt.
If the size isn’t perfect — we’ll replace it for free.

Buy it. Gift it. Enjoy the moment. Size is never an issue.

Ring size conversion chart

 US Size EU Size Inner Diameter (mm)
4.0 47.0 15.0
4.5 48.0 15.3
5.0 49.0 15.7
5.5 50.0 16.1
6.0 51.0 16.5
6.5 52.0 16.9
7.0 54.0 17.3
7.5 55.0 17.7
8.0 57.0 18.1
8.5 58.0 18.5
9.0 59.0 18.9
9.5 60.0 19.3
10.0 62.0
 19.7
10.5 63.0 20.1
11.0 65.0 20.6


Return & Exchange Policy

Return & Exchange Policy

MIRAI Jewelry · quick reference

01

General Return Policy

We accept returns within 30 days of delivery for all items — TRings, Charms, Diamond Casts, and assembled rings (TRing + Charm / TRing + Diamond Cast) — provided that:

  • The item is unworn and unused
  • It is in its original packaging with all tags
  • You have proof of purchase (order confirmation or receipt)

To initiate a return, contact us at: support@mirai-jewelry.com

Returns must be sent to:
KOTAOSTA JEWELRY INNOVATIONS SL
Avd. Burgos, Res. Aqua, 8, floor 3, appart. B
Marques Del Duero, 29670 Marbella, Malaga, Spain

Items sent back without prior authorization will not be accepted.

02

Refunds

Once we receive and inspect your return, we will notify you of approval within 5 business days. If approved, your refund will be processed to your original payment method within 14 days.

Return shipping costs are the responsibility of the customer, except in cases of defect or error on our part.

03

Perfect Fit Guarantee — Free Size Exchange

We understand that buying a ring online — especially as a surprise — makes sizing a challenge. That's why we offer:

Perfect fit guarantee

One free size exchange on any TRing within 60 days of purchase.

  • Applies to TRing base only (not Charms or Diamond Casts)
  • The ring must be in unworn or minimally worn condition
  • Valid once per order
  • Customer covers return shipping to our warehouse
  • We cover shipping of the new size to you

To request a size exchange, contact us at support@mirai-jewelry.com with your order number and the new size needed.

04

The Proposal Experience — She Chooses

Buying as a proposal surprise? Here's how we make it perfect for both of you.

1
You purchase a Diamond Cast and a TRing for the proposal moment.
2
After she says yes, she receives a personal store credit equal to the value of the TRing.
3
She visits mirai.jewelry and selects her preferred TRing design and correct ring size. If the new TRing is more expensive, the difference is charged at checkout. If less expensive, the difference is issued as store credit.
4
We ship her choice directly — she gets the ring she truly loves.
  • Must be activated within 60 days of the original purchase
  • The Diamond Cast chosen for the proposal is a final sale once used

To activate, contact us after the proposal at concierge@mirai-jewelry.com with your order number.

05

Non-Returnable Items

  • Diamond Casts used in a marriage proposal
  • Sale or discounted items
  • Gift cards
  • Items not in original condition or showing signs of wear
06

Defective or Incorrect Items

If you receive a defective, damaged, or incorrect item, please contact us within 7 days of delivery at support@mirai-jewelry.com with photos of the issue.

We will offer a full replacement or full refund including shipping costs.

07

Return Policy by Country

Regardless of the delivery country, all MIRAI Jewelry customers benefit from our standard 30-day return policy as described in Section 1.

Customers in the European Union and United Kingdom are additionally protected by the statutory right to cancel their order within 14 days of receipt, for any reason and without justification, provided the item is unused and in original packaging.

08

How to Start a Return or Exchange

1
Email us at support@mirai-jewelry.com with your order number and reason.
2
We will confirm eligibility and send return instructions within 2 business days.
3
Ship the item to: KOTAOSTA JEWELRY INNOVATIONS SL, Avd. Burgos, Res. Aqua, 8, floor 3, appart. B, Marques Del Duero, 29670 Marbella, Malaga, Spain
4
Once received and inspected within 5 business days, your refund or exchange will be processed.
Compatibility
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How it works
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Reliability
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Patented bayonet system. Zero risk of loss.

Tested and trusted by real people, our locking mechanism ensures a secureand lasting connection.

Click. Twist. Lock.

Each T Ring is designed for effortless charm swapping — no tools, no waiting,just instant transformation.

All T Rings by MIRAI are fully compatible with our charms — no limits.

Mix, match, and transform your ring as you wish — every charm fits everyring.

Build your ring

Turn your charm into a ring.
Choose your base and create a piece that evolves with you.

Create your collection

Mix. Match. Collect. Your style, your meaning.