RING SIZE GUIDE

Find Your Perfect Fit

A well-fitting ring should slide over your knuckle comfortably and sit securely without feeling tight. Use our digital tools below to measure an existing ring, check your finger measurement, or compare international ring sizes.

USE DIGITAL RING SIZER VIEW SIZE CHART

MEASURE AT HOME

Digital Ring Sizer

Choose the method that works best for you. For the most reliable result, measure more than once and compare your results.

Calibrate Your Screen

Place a standard credit or debit card against the screen. Move the slider until the on-screen card is exactly the same width as your physical card, then select Set Calibration.

Adjust card width

Calibration required before measuring a ring.

MATCH THIS TO A STANDARD PAYMENT CARD

85.60 mm

Match the Inside of Your Ring

Place a ring that already fits the intended finger flat against the screen. Adjust the circle until its edge matches the inside edge of your ring.

Adjust ring circle

ALIGN TO THE INNER EDGE OF YOUR RING

BEFORE YOU MEASURE

A Few Things Make a Difference

Measure at a Normal Temperature

Fingers can temporarily shrink when cold and swell when warm. Measure when your hands feel comfortably normal.

Measure More Than Once

Check your size at different times of day. If your measurements repeatedly fall between sizes, the larger size is usually more comfortable.

Consider the Band Width

Wider bands generally feel more snug than delicate bands. Allow a little extra room when choosing a broad wedding band.

Check the Knuckle

Your ring needs to pass over the knuckle while still sitting securely at the base of the finger.

INTERNATIONAL CONVERSION

Ring Size Chart

Use this chart to compare common sizing systems. Measurements are approximate; manufacturing tolerances and ring width can affect fit.

US / CA	UK / AU	EU	Inner Diameter	Circumference

KEEPING IT A SURPRISE?

Finding Someone Else’s Ring Size

Borrow a Ring

Choose a ring they already wear on the same finger and use our digital ring sizer or measure its inner diameter.

Ask Someone They Trust

A close friend or family member may already know their size or can discreetly help you find out.

When in Doubt

If you're choosing between two sizes, the larger size is generally the safer option for comfort. Contact us if you would like guidance before placing the order.

IMPORTANT TO KNOW

Not Every Ring Can Be Resized

Some designs—particularly full eternity bands, intricate pavé settings and certain highly detailed custom rings—may have limited resizing options. If you are unsure of the size, we recommend confirming it before production.

ASK US ABOUT SIZING

RING SIZE FAQ

Good to Know

What is the best way to find my ring size?

If you already own a ring that fits the intended finger well, measuring its inner diameter is usually a convenient starting point. You can also use the calibrated digital ring sizer above or have your finger professionally measured by a jeweler.

What should I do if I am between two sizes?

A slightly larger size is generally more comfortable than a size that is too tight. Band width and knuckle size also matter, so contact us if your measurement falls directly between sizes.

Do wide rings fit differently?

Yes. Wider bands tend to feel tighter because more metal is in contact with the finger. You may need slightly more room than with a thin band.

Can I use a ring worn on another finger?

Ring size can vary between fingers and between hands. For the best estimate, use a ring that is already worn on the exact finger intended for the new ring.

Can all Efi & Co rings be resized?

Resizing depends on the design, setting and amount of change required. Full eternity bands and some intricate stone-set designs may have limited resizing options. Contact us before ordering if sizing is uncertain.

Is the digital ring sizer exact?

It provides an estimate based on your screen calibration and measurement. Browser zoom, display scaling and how the ring is positioned can affect the result. Measure more than once and use the size chart as a second check.