Ring Sizing Explained: How to Get the Perfect Fit from Micoryan

Heart moissanite halo ring in sterling silver, an adjustable one-size design

Most of our rings adjust to fit — here's how to get yours right

Buying a ring online comes with one nagging worry: what if it doesn't fit? It's the single most common reason people hesitate over a ring — and it's exactly the problem we've designed most of ours to avoid. The short version is reassuring: the majority of Micoryan rings are adjustable, one-size designs that fit a range of fingers, so you often don't need to know your exact size at all. For the pieces that do come in set sizes, getting it right at home is easy once you know how. This guide walks through both, so you can order with confidence — wherever in the world you are.

The short version

Most of our rings — including our moissanite and statement styles — are adjustable: an open band that gently opens and closes to fit a range of sizes, so one ring suits most fingers. A few designs, such as certain bands, come in a fixed size instead. Every product page tells you which is which, so always check the listing — but if it says “Adjustable – One Size,” you can usually order without measuring anything.

Adjustable rings: the easy option

An adjustable ring has a small opening at the back of the band, which means it flexes to fit rather than being locked to one measurement. In practice, one adjustable ring comfortably fits a spread of sizes — roughly around UK L to Q (about US 6 to 8, or EU 51 to 57) for a typical design — because you simply widen or narrow it a touch to sit snugly on your finger. Pieces like the Heart Moissanite Halo Ring, the Freshwater Pearl Halo Ring and the Blue Moissanite Butterfly Ring are all adjustable. If you'd like to understand exactly how the design works and how to adjust yours safely, see our guide on why most Micoryan rings are adjustable.

Fixed-size rings: UK, US and EU sizing

Some rings — typically solid bands like the Azure Dreams Band Ring — come in a set size rather than adjusting. Ring sizes are labelled differently around the world: the UK uses letters, the US uses numbers, and the EU uses the band's inside circumference in millimetres. Here's a conversion chart for the most common women's sizes:

UK US EU Inside diameter Inside circumference
J 4.75 48 15.3 mm 48.0 mm
K 5.25 49 15.7 mm 49.3 mm
L 5.75 51 16.1 mm 50.6 mm
M 6.25 52 16.5 mm 51.9 mm
N 6.75 53 16.9 mm 53.1 mm
O 7.25 54 17.3 mm 54.4 mm
P 7.75 56 17.7 mm 55.7 mm
Q 8.25 57 18.1 mm 57.0 mm

These conversions are approximate — sizing systems don't line up perfectly — so the inside diameter and circumference are the most reliable figures to match against. The average women's size in the UK sits around L to N (roughly US 6 to 7, or EU 51 to 53). If you're buying a fixed-size ring and unsure, that's a sensible middle to aim for — but measuring is better, and it only takes a minute.

How to measure your ring size at home

There are two easy ways, and neither needs a special tool:

  • Measure a ring you already own. Take a ring that fits the intended finger, measure the inside diameter straight across the middle in millimetres, and match it to the chart above. This is the most reliable home method.
  • Measure your finger. Wrap a strip of paper or string snugly around the base of the finger, mark where it overlaps, and measure that length in millimetres — that's your circumference. Match it to the chart.

A couple of tips: measure at the end of the day when fingers are at their largest, avoid measuring cold hands (fingers shrink when cold), and remember your knuckle may be wider than the base of your finger — the ring has to slide over it. For the full step-by-step, see our detailed guide on how to find your ring size at home.

What if you're between sizes?

If you land between two sizes, the answer depends on the ring. For an adjustable design, being between sizes doesn't matter — that's exactly what it's built for; just flex it to fit. For a fixed-size ring, size up rather than down: a slightly loose ring is far more comfortable and less likely to get stuck than one that's too tight, and it still needs to pass over your knuckle. Wider bands also tend to feel tighter than thin ones, so if a band is chunky, sizing up a touch helps.

Buying a ring as a gift or surprise

This is where adjustable rings really shine: for a gift, you often don't need the recipient's size at all, which keeps a surprise a surprise. If you've set your heart on a fixed-size piece for a proposal or present, our guide on how to find out her ring size without her knowing covers the discreet ways to do it — and an adjustable ring is always the safe fallback.

If your ring doesn't fit

Don't worry — it's easily sorted. An adjustable ring simply flexes to the right fit (gently, as our adjustable rings guide explains). A fixed-size ring that's not quite right can be exchanged under our returns policy, or resized by a local jeweller. Either way, a size that's slightly off is never the end of the story.

The bottom line

Getting the right ring from Micoryan is more forgiving than most online ring shopping, because most of our designs are adjustable and fit a range of fingers — no exact measurement required. For fixed-size pieces, a one-minute measurement at home against our UK, US and EU size chart gets you there, and sizing up when you're in between keeps things comfortable. Always check the product page to see whether a ring is adjustable or a set size, and you'll order with total confidence.

Browse the full range — adjustable and fixed — in our Rings collection.

Related reading:
Why Most Micoryan Rings Are Adjustable (and How the Design Works)
How to Find Your Ring Size at Home (Without Guessing)
How to Find Out Her Ring Size Without Her Knowing