Ring Sizing Guide

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Finding The Right Fit Matters

A properly fitted ring should feel comfortable, secure, and easy to wear every day. Whether you’re purchasing an engagement ring, wedding band, or surprise gift, understanding your ring size helps ensure the best possible fit.

Finger sizes naturally fluctuate throughout the day depending on temperature, hydration, and activity levels, which is why accurate measuring is important.

Quick Sizing Tips

Small habits that make a meaningful difference in finding your true size.

  • Recommended

    • Measure at the end of the day when fingers are largest
    • Measure your finger 3–4 times for accuracy
    • Account for knuckle size when sizing
    • Use a flexible tape, paper strip or string

  • Avoid

    • Measure at the end of the day when fingers are largest
    • Measure your finger 3–4 times for accuracy
    • Account for knuckle size when sizing
    • Use a flexible tape, paper strip or string

Method One

Measure An Existing Ring

The most accurate way to determine your size from home is by measuring a ring that already fits the intended finger comfortably.

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    Place the ring on paper

    Lay a ring you already wear on the correct
    finger flat on a sheet of cream paper.

  • Measure the inner diameter

    Use a ruler to measure the inner diameter in millimetres, point to point across the centre.

  • Match to our size chart

    Compare the measurement to our chart below to find your perfect size.
International Reference

Ring Size Chart

Find your size across Australian, US and millimetre measurements.

AU Size Inside Diameter Circumference
F 14.1mm 44.2mm
G 14.5mm 45.5mm
H 14.9mm 46.7mm
I 15.3mm 48mm
J 15.5 mm 48.7mm
K 15.9mm 49.9 mm
L 16.3 mm 51.2 mm
M 16.7 mm 52.5 mm
N 17.1 mm 53.8 mm
O 17.5 mm 55 mm
P 17.9 mm 56.3 mm
Q 18.3 mm 57.6 mm
R 18.7 mm 58.9 mm
S 19.2 mm 60.1 mm
T 19.6 mm 61.4 mm
U 20 mm 62.7 mm
V 20.4 mm 64 mm
W 20.8 mm 65.2 mm
X 21.1 mm 66.5 mm
Y 21.6 mm 67.8 mm
Z 21.8 mm 68.4 mm

Method Two

The string or Paper Method

No ring to measure from? This timeless technique is all you need.

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Step One

Wrap a string around the base of your finger

Use a thin string or strip of paper. Wrap it snugly comfortable, not tight at the base where your ring will sit.

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Step Two

Mark, lay flat and measure in millimetres

Mark where the ends meet, lay the string flat against a ruler, and measure in mm. Match the circumference to our chart.

What a Properly Fitted Ring Should Feel Like

A well-sized ring is something you forget you're wearing until you catch it in the light.

  • Slides on comfortably

    Ring glides smoothly over your finger without pinching, grabbing, or requiring force to put on.

  • Slight resistance

    A properly fitted ring should slide over your knuckle with gentle resistance. It should feel snug and secure, but never tight or uncomfortable.

  • Feels secure

    Rests snugly at the base of your finger, staying in place without spinning excessively or sliding off on its own.

Wide Bands vs. Thin Bands

Band width changes how a ring feels here's how to choose.

  • Sized half a size up

    Wider bands (5mm+) feel tighter on the finger. Add half a size to your usual measurement for daily comfort.

  • Thinner Bands

    Delicate bands (under 3mm) sit lightly. Stay true to your measured size for a precise, elegant fit.

Planning a Surprise Proposal?

If you’re trying to determine a partner’s ring size discreetly, consider:

  • Borrowing an existing ring
  • Asking friends or family
  • Comparing against your own finger

Complimentary Ring Resizing

Getting the perfect fit should be effortless. Every eligible ring from SkyGem & Co. includes one free ring resize within 12 months of purchase so you can wear your piece with complete confidence.

Good to Know Before Resizing Your Ring:

  • 12-Month Complimentary Service: Enjoy one free resize for all eligible engagement and wedding rings during your first year.
  • Eternity Bands: Because diamonds wrap continuously around full eternity rings, they generally cannot be resized.
  • Major Size Changes: Extreme size adjustments may require us to remanufacture the band to maintain its structural integrity.
  • Band Width Matters: Wider ring bands naturally sit a bit snugger than delicate bands, so you might prefer a slightly larger size for daily comfort.

Still unsure about your ring size? Our team is always here to guide you toward the perfect fit—whether you're shopping for a surprise proposal or adjusting a piece you already love.

Common Ring Sizing Mistakes

At SkyGem & Co., many rings can be resized if adjustments are needed after purchase.

  • Measuring at the wrong time

    Our fingers naturally expand and contract with changes in temperature. For the most accurate measurement, size your ring in the afternoon when your fingers are at their normal size.

  • Using a stretchy material

    Elastic bands or hair ties stretch and distort. Always use rigid paper or thin string.

  • Sizing a different finger

    Each finger has a different size even left and right hands rarely match.

  • Ignoring knuckle width

    A larger knuckle needs slightly more room measure both the base and the knuckle.

Ring Sizing FAQs

How do I measure my ring size at home?

You can measure your ring size using either an existing ring or a strip of paper/string. Wrap it snugly around the base of your finger, mark where the ends meet, then measure the length in millimetres and compare it to a ring size chart.

What if I’m between ring sizes?

If you fall between two sizes, we generally recommend choosing the larger size for a more comfortable fit especially if your fingers tend to swell throughout the day.

Do wider rings fit tighter?

Yes. Wider bands usually feel tighter than thinner styles because they cover more of the finger. For wide rings, many people prefer going up half a size for added comfort.

Can engagement rings be resized?

Most engagement rings can be resized by a professional jeweler. However, the amount a ring can be adjusted depends on the design, metal type, and stone setting.

Are men’s and women’s ring sizes different?

Ring sizing follows the same scale for everyone. The main difference is that men’s rings are typically made in larger average sizes than women’s rings.

Personalized jewellery consultations, wherever you are. Personalized jewellery consultations, wherever you are.
Personalized jewellery consultations, wherever you are.
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