Choosing Your Ring Size

Find your size in just a few minutes, without leaving home—and make sure to measure accurately before ordering.

1 What is a ring size?

In France, a ring size equals the inner circumference of the ring, in millimeters. Size 52? That means a circumference of 52 mm. It’s as simple as that.

2 Why It Deserves 5 Minutes of Your Attention

A ring that's too tight or too loose is never a trivial matter—especially when it's custom-made just for you.

1 Comfort
If it's too tight, it cuts into your finger and is a pain to take off.

2 Safety
If it's too loose, it twists, slips… and can get lost.

3 The Fall
When it fits properly, it stays in place and shows off the jewelry.

4 The Adjustment
It is still possible to adjust the size after production, but only upon request.

3 How to Measure at Home

Three ways to find your size without leaving home.

1 A ring you already wear
Place it on a ruler and measure its inner diameter, edge to edge (not including the metal). Check the conversion chart below.

2 Our printable ring sizer
Print it at 100 % (use a ruler to check that the 5 cm reference mark is actually 5 cm), place a ring over the circles, and identify the one that matches exactly.

3 Have a Thea ring sizer delivered to your home
Upon request, we'll send you a physical ring sizer to your address—convenient for trying it on directly, without a printer. Email us at hello@thea-jewelry.com with your mailing address.

4 The Right Time (and Pitfalls to Avoid)

Your ring size is not a constant—it varies depending on several factors.

1 Measure in at the end of the day, at room temperature — The fingers swell slightly with the heat and as the hours go by.

2 It's all in the hand — Measure the exact finger that will wear the ring; the left and right hands are often different.

3 Pregnancy, Water Retention — may slightly affect your usual size.

4 Not sure which size to choose? Always choose the largest one.

5 Wide ring (more than 6 mm)? Go up half a size—a wide ring feels tighter than a thin one.

5 To summarize

1 Take the measurement at the end of the day, at room temperature.

2 Use our printed ring sizer at 100 %—it's the most reliable method.

3 Is the ring too big? Go up half a size.

4 Not sure which size to choose? Always go with the larger one.

5 Have a question? Contact us before you order—not after.

6 Before confirming your order

The key point to remember

Custom-made and bespoke jewelry is neither exchangeable nor refundable—each piece is one-of-a-kind, designed just for you. Good news: if the size you chose doesn’t fit when you receive it, we can always adjust it according to your instructions; resizing is then done based on a quote. Be sure to take five minutes to measure yourself before ordering, to make sure you have the right size.