CustomQuote
Find Your Ring Size
South African, UK, US and international ring size chart.
Answer first: the best ring size is the size that slides over the knuckle with light resistance, sits securely at the base of the finger, and feels comfortable through the day.
In South Africa, ring sizes usually follow the UK letter system, while many international charts use US numbers, European circumference, German diameter or Asian number systems.
For custom engagement rings and wedding bands, ring size should always be confirmed carefully before production because the design itself affects how the ring feels.
Method 1: Use A Proper Ring Sizer
- The easiest and most accurate option is usually visiting a nearby jewellery store such as Sterns, American Swiss, or Browns The Diamond Store, as most jewellers use the same standard ring sizing system.
- If you would like to keep the ring a surprise, you can discreetly borrow a ring she already wears on the correct finger and use that as a reference.
- Alternatively, you can use a ring sizer from Takealot or another supplier to measure at home.
- Always measure the exact finger and hand where the ring will be worn.
- Place the ring sizer around the base of the finger.
- Tighten the sizer until it feels snug, but still comfortable.
- Make sure the sizer can still pass over the knuckle with slight resistance.
- Repeat the measurement later in the day, as finger sizes can naturally change slightly depending on temperature and time.
Method 2: Measure An Existing Ring
- Choose a ring that fits the same finger on the same hand.
- Ensure its the ring finger on the left hand.
- Measure the internal diameter across the inside of the ring in millimetres.
- You can do this using a vernier or clear lined ruler.
- Do not include the metal edge in the measurement.
- Compare the diameter to the chart below.
- Confirm with a jeweller if the ring is for a custom piece.
Method 3: Paper Strip or Soft Tape
- Cut a thin strip of paper or use non-stretch string.
- or Wrap a soft tape around the finger.
- Wrap it around the base of the finger and ensure its firm.
- Mark where the ends meet.
- Measure the knuckle too if it is larger than the finger base.
- Lay it flat and measure the length in millimetres.
- Compare the result to the conversion chart.
- Use that number as the inner circumference.
Method 4: The Ask Method
- Ask her sister if she knows the ring size.
- Ask her mother or a close family member.
- Ask her best friend discreetly.
- If you already have someone helping with the proposal, they can often assist naturally without raising suspicion.
- Many people are surprised how often friends or family already know the answer — especially if engagement conversations have happened before.
- Just remember to keep it subtle. The best ring surprises usually involve one or two trusted people helping behind the scenes.
OgilvieGems sizing rule.
For an important custom ring, do not rely on one quick measurement.
Measure the same finger at least twice, preferably at different times of day, then adjust for the design style.
A fine solitaire, a thick wedding band and a full eternity ring can all feel different even when the chart size is technically the same.
Use this chart to compare US number sizes, South African/UK letter sizes, European circumference sizes, German diameter sizes, Asian sizes and Italian/Swiss/Spanish sizes.
South Africa generally follows UK letter sizing.
| US / Canada | Inside Circumference mm | Inside Diameter mm | SA / UK / AU | France / Europe | Germany | India / China / Japan | Italy / Spain / Switzerland |
|---|---|---|---|---|---|---|---|
| 3 | 44.2 | 14.07 | F | 44 | 14 | 4 | 4 |
| 3.25 | 44.8 | 14.26 | F 1/2 | 45 | 14.25 | - | 4 5/8 |
| 3.5 | 45.5 | 14.49 | G | 45.5 | 14.5 | 5 | 5 1/4 |
| 3.75 | 46.1 | 14.68 | G 1/2 | 46 | 14.75 | 6 | 5 7/8 |
| 4 | 46.8 | 14.90 | H | 47 | 15 | 7 | 6 1/2 |
| 4.25 | 47.4 | 15.09 | H 1/2 | 47.5 | - | - | 7 1/8 |
| 4.5 | 48.0 | 15.29 | I | 48 | 15.25 | 8 | 7 3/4 |
| 4.75 | 48.7 | 15.50 | J | 48.5 | 15.5 | - | 8 3/8 |
| 5 | 49.3 | 15.70 | J 1/2 | 49 | 15.75 | 9 | 9 |
| 5.25 | 50.0 | 15.92 | K | 50 | 16 | - | 9 5/8 |
| 5.5 | 50.6 | 16.10 | K 1/2 | 50.5 | 16.25 | 10 | 10 1/4 |
| 5.75 | 51.2 | 16.31 | L | 51 | - | 11 | 10 7/8 |
| 6 | 51.9 | 16.51 | L 1/2 | 52 | 16.5 | 12 | 11 1/2 |
| 6.25 | 52.5 | 16.71 | M | 52.5 | 16.75 | - | 12 1/8 |
| 6.5 | 53.1 | 16.92 | M 1/2 | 53 | 17 | 13 | 12 3/4 |
| 6.75 | 53.8 | 17.12 | N | 54 | - | - | 13 3/8 |
| 7 | 54.4 | 17.35 | N 1/2 | 54.5 | 17.25 | 14 | 14 |
| 7.25 | 55.1 | 17.53 | O | 55 | 17.5 | - | 14 5/8 |
| 7.5 | 55.7 | 17.75 | O 1/2 | 56 | 17.75 | 15 | 15 1/4 |
| 7.75 | 56.3 | 17.93 | P | 56.5 | 18 | - | 15 7/8 |
| 8 | 57.0 | 18.14 | P 1/2 | 57 | - | 16 | 16 1/2 |
| 8.25 | 57.6 | 18.34 | Q | 58 | 18.25 | - | 17 1/8 |
| 8.5 | 58.3 | 18.53 | Q 1/2 | 58.5 | 18.5 | 17 | 17 3/4 |
| 8.75 | 58.9 | 18.75 | R | 59 | 18.75 | - | 18 3/8 |
| 9 | 59.5 | 18.95 | R 1/2 | 60 | 19 | 18 | 19 |
| 9.25 | 60.2 | 19.15 | S | 60.5 | 19.25 | - | 19 5/8 |
| 9.5 | 60.8 | 19.35 | S 1/2 | 61 | 19.5 | 19 | 20 1/4 |
| 9.75 | 61.4 | 19.56 | T | 61.5 | - | - | 20 7/8 |
| 10 | 62.1 | 19.76 | T 1/2 | 62 | 19.75 | 20 | 21 1/2 |
| 10.25 | 62.7 | 19.97 | U | 63 | 20 | 21 | 22 1/8 |
| 10.5 | 63.4 | 20.17 | U 1/2 | 63.5 | - | 22 | 22 3/4 |
| 10.75 | 64.0 | 20.37 | V | 64 | 20.5 | - | 23 3/8 |
| 11 | 64.6 | 20.57 | V 1/2 | 65 | 20.75 | 23 | 24 |
| 11.25 | 65.3 | 20.78 | W | 65.5 | - | - | 24 5/8 |
| 11.5 | 65.9 | 20.98 | W 1/2 | 66 | 21 | 24 | 25 1/4 |
| 11.75 | 66.6 | 21.19 | X | 67 | 21.25 | - | 25 7/8 |
| 12 | 67.2 | 21.39 | X 1/2 | 67.5 | 21.5 | 25 | 26 1/2 |
| 12.25 | 68.1 | 21.60 | Y | 68 | - | - | 27 1/8 |
| 12.5 | 68.5 | 21.80 | Z | 69 | 21.75 | 26 | 27 3/4 |
| 12.75 | 69.1 | 22.00 | Z 1/2 | 69.5 | - | - | 28 3/8 |
| 13 | 69.7 | 22.20 | - | 70 | 22 | 27 | 29 |
Note: international ring size conversions can vary slightly between manufacturers. For custom production, confirm the size with OgilvieGems before final approval.
For custom jewellery, measure carefully and confirm more than once.
At-home measuring can be accurate, but paper and string methods are still estimates because soft materials can stretch, twist or sit too tightly.
Correct Fit
The ring moves over the knuckle with gentle resistance, rests securely at the base of the finger, and can be removed without force.
Too Small
The ring pinches, leaves a strong mark, feels uncomfortable in warm weather, or is difficult to remove safely.
Too Large
The ring spins constantly, slides over the knuckle too easily, or feels at risk of slipping off when hands are cold or wet.
Measure At Home
For custom jewellery, measure carefully and confirm more than once.
At-home measuring can be accurate, but paper and string methods are still estimates because soft materials can stretch, twist or sit too tightly.
A ring should not be judged only by a number or letter.
The correct size depends on the finger, knuckle, hand temperature, band width, ring profile and whether the design can safely be resized later.
Circumference is the distance around the inside of the ring. Diameter is the straight-line distance across the inside of the ring.
Both can be used, but circumference is often easier when measuring a finger, while diameter is useful when measuring an existing ring.
Measuring A Finger
Use circumference in millimetres. Wrap a flexible tape, paper strip or string around the base of the finger and measure the full length.
Measuring An Existing Ring
Use internal diameter in millimetres. Measure only the empty space inside the ring, not the metal thickness.
Converting Manually
Approximate formula: circumference = diameter × 3.1416. For example, an internal diameter near 17.35mm is close to a 54.4mm circumference, which is around US 7 / SA-UK N 1/2.
A ring size chart gives the measurement, but the jewellery design determines how that measurement feels on the hand.
Thin Engagement Rings
A fine 1.5mm to 2mm band usually feels easier to wear than a thick band. It may not need to be sized up unless the knuckle is prominent or the client prefers a looser fit.
Wide Wedding Bands
Wide bands create more contact with the finger and often feel tighter. A wider band may need a slightly larger size than a narrow ring worn on the same finger.
Full Eternity Rings
Full eternity rings need extra care because stones continue around the band. They are beautiful but often difficult or impossible to resize without remaking the ring.
Stacked Rings
When multiple rings are worn together, they can feel tighter as a set. If an engagement ring and wedding band are worn as a stack, test the combined width before finalising the wedding band size.
Comfort-Fit Bands
A comfort-fit band has a rounded inner profile and may feel smoother over the knuckle. It can feel slightly different from a flat inner band of the same size.
Large Centre Stones
Top-heavy rings can spin if the ring is too loose. The correct size must balance comfort with enough security to keep the ring upright during normal wear.
For surprise engagement rings, the goal is to reduce risk rather than pretend guessing is perfect.
A secret measurement is useful, but it should be treated as an informed estimate.
Borrow A Ring Briefly
Use a ring worn on the correct finger if possible. Measure the internal diameter or bring the ring to OgilvieGems for sizing.
Trace The Inside
Place the ring flat on paper and trace the inside circle carefully. This gives a jeweller a useful starting point.
Ask Someone Close
A sibling, parent or close friend may know the size or may be able to help without making the surprise obvious.
Do not guess from the wrong ring.
Do not use a thumb ring, middle-finger ring or right-hand ring and assume it will fit the left ring finger.
Finger sizes differ from hand to hand and finger to finger.
Some rings resize easily. Others need caution.
This is why sizing should be discussed before final production, especially for custom jewellery.
Usually Easier To Resize
- Plain bands
- Simple solitaire engagement rings
- Rings with a plain sizing area at the back
- Many classic gold or platinum designs
Often Difficult To Resize
- Full eternity rings
- Pavé bands with stones more than 1/2 way around the shank
- Full Engraved or patterned bands
- Mixed-metal designs
- Alternative metals or very delicate structures
Ring Size FAQs
What ring size system is used in South Africa?
South Africa usually follows the UK letter sizing system. That means sizes such as J, K, L, M, N, O, P, Q and R are commonly used locally. Some international jewellers use US number sizing, so a conversion chart is useful when comparing rings or quotes.
What is the most accurate way to measure ring size at home?
The most accurate at-home option is to use a proper ring sizer or measure an existing ring that fits the correct finger well. String and paper can help, but they stretch, twist and flatten, so they are best used as a guide rather than a final production measurement.
Should I size up or down if I am between sizes?
If you are between sizes, the safer choice often depends on the design. For wider bands, thicker rings or rings with a flat inner profile, size slightly up. For very fine bands, a true size or slightly smaller size may feel more secure. For engagement rings, comfort over the knuckle and security at the base of the finger both matter.
Do wider bands fit tighter?
Yes. Wider bands usually feel tighter because more metal touches the finger. A 5mm to 8mm wedding band may need to be slightly larger than a fine 1.5mm to 2mm engagement ring, even for the same finger.
Can an engagement ring be resized?
Many solitaire and simple engagement rings can be resized, but not every ring can be adjusted safely. Eternity bands, very detailed pavé bands, engraved bands, mixed-metal designs and rings with stones all around the shank may have limited resize options.
Can a full eternity ring be resized?
A full eternity ring is difficult to resize because stones usually continue around the full band. In many cases it may need to be remade rather than resized, which is why accurate sizing is important before production.
What time of day should I measure my finger?
Measure later in the day when your hands are at a normal temperature. Fingers can be smaller in cold weather and slightly larger after heat, exercise, salty meals or water retention.
Which finger should I measure?
Measure the exact finger and hand where the ring will be worn. The left and right hands are often not identical, and the dominant hand may be slightly larger.
How should a ring fit?
A good fit should slide over the knuckle with gentle resistance, sit securely at the base of the finger, and come off without excessive force. It should not leave a deep mark or spin constantly.
Can I secretly measure someone else’s ring?
Yes, but only use a ring that fits the same finger on the same hand. Trace the inside of the ring, measure its internal diameter in millimetres, or place it on a ring chart. This is useful for surprise engagement rings, but it is still an estimate.
What if the knuckle is much bigger than the base of the finger?
Measure both the knuckle and the base of the finger. The final size often needs to sit between the two measurements so the ring can pass over the knuckle but does not spin too loosely once worn.
Is millimetre measurement better than guessing a letter size?
Yes. Inner circumference and inner diameter in millimetres give a more precise starting point than guessing. Letter and number sizes are useful, but millimetres help compare international sizing systems.
Can ring size change over time?
Yes. Finger size can change with temperature, weight changes, pregnancy, medication, age, activity, hydration and season. For important rings, confirm sizing close to the production date.
What size is average for women?
Many women fall around UK L to O or US 6 to 7.5, but averages are not reliable enough for custom jewellery. Always measure the actual finger.
What size is average for men?
Many men fall around UK R to T or US 9 to 10.5, but hand shape and band width make a big difference. Always measure the exact finger and intended band width.
Not sure of the size? Let us help before we craft it.
For custom engagement rings, wedding bands and meaningful fine jewellery, ring size is not a small detail. It affects comfort, daily wear, design security and whether future resizing will be simple or limited.