Southern Star Diamonds

The Ring Fit Studio

One accurate measurement, every size translated. Start with the sizing system or millimetre measurement you already know.

Find my size
Your personal size match

Find the closest fit

Choose a reference system, then select the size you know. Your full conversion appears instantly.

01
Choose your referenceWhich size do you already know?
02
Select your known sizeUse the closest available measurement.
03
Choose what you want to knowSelect the result system you need.

Accuracy note Measure two or three times. If results differ, use the largest consistent measurement.

Your requested conversion

Select your known size

AU / UK—
US / Canada—
Europe—
Diameter—
Circumference—
SmallerAverage rangeLarger
Continue to ring settings
No known size?

Measure your ring size at home

Choose either method below. For the most reliable result, measure at least twice and compare your answer in the Ring Fit Studio above.

Method 01

Use a ring that already fits

  1. 1

    Choose the correct ringUse a ring that fits comfortably on the same finger and hand where the new ring will be worn.

  2. 2

    Place it on a flat surfaceKeep the ring level and make sure its natural circular shape is not distorted.

  3. 3

    Measure the inside diameterUsing a millimetre ruler, measure straight across the widest inside point through the centre. Do not include the metal edges.

  4. 4

    Convert your measurementSelect “Diameter” in the Ring Fit Studio and choose the closest millimetre measurement.

Inside edge to inside edge
Method 02

Measure around your finger

  1. 1

    Prepare a paper stripCut a narrow strip of non-stretch paper. Avoid string or elastic materials that can tighten.

  2. 2

    Wrap the finger baseWrap it where the ring will sit. It should feel secure but still pass over your knuckle.

  3. 3

    Mark and measureMark where the paper overlaps, lay it flat, and measure from the end to the mark in millimetres.

  4. 4

    Check the resultRepeat twice later in the day. Use the largest consistent measurement and compare it with circumference in the converter.

01020304050 mm

Print checkThe ruler above must measure exactly 50 mm when printed at 100% or “Actual size”. Do not use “Fit to page”.

Between sizes?Choose the larger size, especially for a wide band or a prominent knuckle.

Best timeMeasure when your hands are comfortably warm, preferably near the end of the day.

A fit that feels right

Small details make a better measurement.

Measure later in the dayFingers naturally change size. Measure when your hands are comfortably warm.

Consider the band widthWider bands feel tighter than fine bands and may need a slightly larger size.

Check the knuckleYour ring must pass over the knuckle while still sitting securely at the finger base.

Planning a surprise?Borrow a ring from the correct finger or ask someone close to the wearer for help.

Still unsure?

Let us check it with you.

Send us your measurement or speak with our team before production. Eligible rings include complimentary resizing within 30 days of delivery.

Ask a specialist on WhatsApp
Sizing questions

Useful answers

What if I am between two sizes?

Choose the larger size, particularly if the band is wide or your knuckle is noticeably larger than the finger base.

What is a common engagement ring size?

Australian sizes K to P are common, but every hand is different. Your own measurement should always guide the order.

Can every ring be resized?

Most rings can be adjusted within a limited range. Full-eternity, highly detailed or certain alternative-metal designs may have restrictions.