How to Find Your Ring Size Without a Sizer

Ring sizing done wrong = you paid $200 for a ring that spins all day or gets stuck. Here's how to size yourself accurately with what you have at home.

Method 1: Borrow a ring that fits

The most accurate method — if you have a ring that currently fits the finger you want to buy for.

1. Lay the ring flat.
2. Measure the inner diameter edge-to-edge across the opening, in millimeters.
3. Use our size chart: 15.7 mm = size 5, 16.5 = 6, 17.3 = 7, 18.2 = 8, 19.0 = 9.

Accuracy: ±0.25 size. The best approach we have.

Method 2: String / paper strip

If you don't have a ring to borrow:

1. Cut a thin strip of paper or use a piece of string, ~8 cm long.
2. Wrap snugly around the base of the finger you want to size. Tight enough to not slide but comfortable.
3. Mark where the string overlaps, then lay it flat and measure in millimeters.
4. That's your finger circumference. Divide by 3.14 to get diameter → match to our chart.

Accuracy: ±0.5 size. Good enough for a comfortable first order, with our free resize as backup.

When to measure

Finger size fluctuates by up to half a size across a day. Measure:

• Afternoon (fingers are at average size)
• Room temperature (not right after exercise, not in cold)
• Three times — use the average

Knuckle clearance

If your knuckle is much larger than your finger base (common), size to the knuckle, not the base. A ring that fits the base but can't clear the knuckle won't go on.

Stacking rings

Stacking rings on the same finger take up space. If you plan to stack 2-3 rings on one finger, size up 0.5 on the supporting rings (not the anchor). See our stacking ring guide.

Common mistakes

• Sizing from a ring worn on a different finger (fingers vary)
• Measuring first thing in the morning (fingers are smaller then)
• Sizing too tight "for security" (ends up stuck)
• Sizing too loose "so it's comfortable" (ends up lost)

Still unsure?

Every Coralie Lu ring includes one free resize within 60 days. Email us with your measurement method and we'll give you our recommendation before you order. See Resizing Service.