How to Choose Your Ring Size: A Complete Guide for Singapore Couples
Why Ring Size Matters More Than You Think
A ring that doesn't fit is more than an inconvenience. Too tight, and it's uncomfortable to wear and difficult to remove. Too loose, and it risks slipping off — particularly in Singapore's heat and humidity, which can cause fingers to swell slightly during the day and contract at night.
The good news: ring size is one of the few things about an engagement ring that can be adjusted after the fact. But resizing takes time, costs money, and isn't always straightforward (especially with rings that have diamonds set all the way around). Getting it right at the start is always the better path.
This guide covers everything you need to know — from how to measure at home, to what to do when you want to surprise your partner and have no idea what size they wear.
Understanding Ring Sizes: International Standards
Ring sizing isn't universal. Different countries use different systems, which can be confusing when you're shopping internationally or comparing sizes across brands.
In Singapore, most jewellers use either the US/Canada sizing system (numerical, e.g. US 6, US 7) or the British/Australian alphabetical system (e.g. L, N, P). Some European jewellers use a millimetre-based circumference system. At Diamond Ateliers, we work primarily with US sizing — it's the most widely understood system among our clients and international diamond suppliers.
As a rough reference for women's engagement rings:
- US 5–5.5 — petite hands, narrow fingers
- US 6–6.5 — the most common range for women in Singapore
- US 7–7.5 — slightly wider fingers
- US 8+ — larger hands
For men's bands:
- US 8–9 is the most common range for Singaporean men
These are generalisations only — finger size varies enormously, and the only way to know for certain is to measure.
Method 1: Visit a Jeweller for Professional Sizing
The most reliable method by far. A jeweller uses a set of metal ring sizers — small rings of graduated sizes — and simply has you try them on. You'll know immediately whether a size fits well: it should slide on with mild resistance over the knuckle and sit snugly (but not tightly) against the base of the finger.
A few things your jeweller will consider during professional sizing:
- Time of day — fingers are slightly larger in the afternoon and evening than in the morning. For the most accurate result, size after midday.
- Temperature — fingers swell slightly in heat and contract in cold. Singapore's climate means fingers tend to run slightly larger than in cooler countries.
- Which hand and which finger — in Singapore, engagement and wedding rings are traditionally worn on the left ring finger. Your right ring finger is often a different size to your left.
- Knuckle size — if your knuckle is noticeably larger than the base of your finger, you'll need to size for the knuckle (so the ring passes over it) and potentially add a ring guard later to prevent spinning.
Method 2: Measure at Home with String or Paper
If you can't visit a jeweller immediately, a simple home measurement will give you a working estimate.
What you'll need: a thin strip of paper (or a piece of string), a ruler, and a pen.
Steps:
- Wrap the paper or string snugly around the base of your ring finger. Not so tight it digs in — just touching the skin comfortably.
- Mark the point where the paper overlaps with a pen.
- Lay the paper flat and measure the length from one end to the mark in millimetres. This is your finger circumference.
- Use a ring size conversion chart to match your circumference to a US size. As a quick guide: 49–51mm ≈ US 5; 51–53mm ≈ US 5.5–6; 53–55mm ≈ US 6.5–7; 55–57mm ≈ US 7.5–8.
This method is a reasonable estimate, but it can be off by half a size in either direction. We recommend following up with an in-store fitting before the ring is made.
Method 3: Use an Existing Ring
If you (or your partner) already own a ring that fits the correct finger, this is one of the simplest methods. A jeweller can measure the internal diameter of the ring and convert it directly to a size. You can also do this at home with a ruler: measure across the inside of the ring at its widest point in millimetres, and convert using a diameter-to-size chart (e.g. 16.5mm ≈ US 6; 17.3mm ≈ US 7).
The key is to make sure the ring you're measuring fits the correct finger on the correct hand. A ring worn on the right index finger won't reliably tell you the left ring finger size.
The Surprise Proposal Problem
This is where most clients come to us looking slightly panicked. You want to surprise your partner, which means you can't simply ask them for their ring size — but you also don't want to guess incorrectly and have to immediately confess the ring doesn't fit.
Here are the most effective approaches our clients have used:
Borrow an existing ring. Take one of your partner's rings (from the correct finger on the correct hand, ideally) to a jeweller for sizing. Return it before they notice. This is the most reliable method.
Enlist a friend or family member. A close friend, sibling, or parent who knows the relevant details can sometimes ask casually, or even take your partner ring shopping under a pretence (trying on cocktail rings, for example) and remember the size that fit.
Trace around a ring. If borrowing isn't possible, place one of their rings on a piece of paper and trace the inside circumference. This gives a jeweller enough information to estimate a size.
Make your best guess, size slightly large. If all else fails, err on the side of a slightly larger size (half a size up from your estimate). A ring that's too large can always be temporarily worn with a ring guard, and resizing down is generally easier than resizing up.
How Bespoke Rings Handle Sizing
When you commission a bespoke ring at Diamond Ateliers, sizing is worked into the process from the beginning. We take a professional measurement at the initial consultation, and the ring is cast to that exact size. This eliminates much of the guesswork.
For surprise proposals, we have an established approach: we make the ring in a standard size based on the best available information, with a built-in allowance for one complimentary resize after the proposal. This way, the ring is beautiful and wearable on the night — and can be perfected shortly after.
Ring Resizing: What You Should Know
Resizing is routine for most ring styles, but there are limits.
Simple bands (plain gold or platinum) can be resized up or down by 2–3 sizes without issue. The jeweller cuts the shank, adds or removes metal, and rejoins it.
Diamond-set rings (pavé bands, eternity rings, rings with stones around the entire shank) are much harder to resize. Adding stones is expensive; removing them risks damaging settings. For these styles, getting the size right at the point of manufacture is especially important.
Solitaire rings (plain shank, stone only in the head) can usually be resized by 1–2 sizes without affecting the appearance. If a larger resize is needed, the shank may need to be rebuilt.
Platinum rings are harder to resize than gold because the metal work-hardens — it requires a specialist with the right equipment. Any reputable jeweller should be able to advise on whether a particular ring is a good candidate for resizing before you commit.
Finger Size Changes Over Time
Worth knowing: ring size isn't permanent. Fingers can change size due to weight changes, pregnancy, ageing, or even seasonal temperature shifts. If a ring that once fit perfectly has become tight, don't force it — see a jeweller about resizing rather than risk damaging the shank or cutting off circulation.
Many couples also choose to have wedding bands made slightly larger than engagement rings for everyday comfort, particularly if they plan to stack the two rings together.
Visit Us for a Complimentary Ring Sizing
If you're in the early stages of planning an engagement ring, come into the showroom for a complimentary ring sizing and an informal chat about what you're looking for. No commitment, no pressure — just clarity on one of the first and most practical questions in the process.
Visit us at 176 Orchard Rd, #03-05 The Centrepoint, Singapore 238843, or reach out on WhatsApp to arrange a convenient time.