You have the ring picked out, the moment planned, and one stubborn question left: what size is her finger? Asking gives the game away, and guessing feels like a gamble. The good news is that ring size is one of the easiest things to learn quietly, and a small miss is simple to fix. Here is how to get it right without saying a word.

Why ring size matters more than you think

A ring that is too loose spins, slides off when her hands are cold, and turns the center stone toward her palm. A ring that is too tight is uncomfortable and stays in the jewelry box. Sizes in the US run in quarter and half steps, and each full size is less than a millimeter of difference in diameter, so a close estimate is worth the effort. Most women in the US wear between a 5 and a 7, with 6 the most common, but averages are a starting point, not an answer.

Six discreet ways to find her ring size

1. Borrow a ring she already wears

This is the most reliable method. Find a ring she wears on her left ring finger, or failing that, the right ring finger. Bring it to any jeweler, or measure it yourself (see the chart below). Note that the dominant hand usually runs about a half size larger, so a ring from her right hand may be slightly big for her left if she is right-handed.

2. Trace or press it when you cannot take it

If borrowing the ring would be noticed, trace the inside circle on paper with a sharp pencil, or press it gently into a bar of soap or a ball of modeling clay. You only need the inside edge. Measure across the widest point of that circle in millimeters.

3. Slide it onto your own finger

No ruler? Slip her ring onto your finger and mark with a pen exactly where it stops. Later, a jeweler can measure your finger at that line. It is not perfect, but it usually lands within a half size.

4. Enlist a friend or family member

Her sister, best friend, or mother may already know her size, or can find out naturally. A friend who suggests trying on rings "just for fun" during a shopping trip can learn a size in minutes without raising an eyebrow.

5. Look for clues she has already left

Past jewelry orders, saved wish lists, and receipts often list a size. If she has ever had a ring resized, the jeweler may also have a record under her name.

6. Read her hands

If none of the above works, compare her fingers to your own or to those of someone whose size you know. Slender fingers often fall between 4.5 and 5.5, average fingers between 6 and 7, and fuller fingers 7.5 and up. Use this only as a last resort, and when unsure, choose the larger of two sizes.

Convert the inside diameter to a ring size

Once you have the inside diameter of her ring in millimeters, match it to the closest US size:

• 14.9 mm: size 4
• 15.7 mm: size 5
• 16.1 mm: size 5.5
• 16.5 mm: size 6
• 16.9 mm: size 6.5
• 17.3 mm: size 7
• 18.1 mm: size 8
• 19.0 mm: size 9

If the measurement falls between two sizes, choose the larger one. Our full chart is on the ring size chart page.

Small factors that change the fit

Temperature and time of day. Fingers swell in heat and in the evening and shrink in the cold. A ring measured on a winter morning may feel snug by a summer night.

Knuckles. If her knuckle is noticeably wider than the base of her finger, the ring has to pass over it, so size for the knuckle and let the band sit comfortably below.

Band width. Wider bands fit tighter. Our engagement settings sit on slim bands of roughly 1.8 to 2 mm, so a ring she already wears in a similar width is the best reference.

What if your guess is slightly off?

Breathe. Every Luxe Gemmes engagement ring is handcrafted to order in solid 14K gold or platinum, and every order includes one complimentary resize within 30 days of your ship date. A classic solitaire or hidden halo setting, like our Radiant Hidden Halo or Cushion Hidden Halo, can be sized up or down without disturbing the center stone or the halo tucked beneath it.

Two exceptions are worth knowing before you order. Eternity bands and contoured bands, with stones running all the way around or a curve shaped to fit a specific ring, cannot be resized easily and are final sale. If you are unsure of her size, choose a solitaire or hidden halo for the proposal and add the band later, once she has worn her ring and you know the fit.

Plan around the timeline

Because each ring is made for you after you order, production takes 3 to 4 weeks. Once it ships, delivery is free, fully insured and express, with a signature required. If you are planning a holiday proposal, give yourself room for production, delivery, and a possible resize, and order by the holiday cutoff shown on our homepage each season. Curious what happens in those weeks? Read why made-to-order takes 3 to 4 weeks.

Frequently asked questions

What is the most common ring size for women?

In the US, size 6 is the most common, and most women wear between a 5 and a 7. Use it as a fallback only if every other method fails.

Should I size up or down if I am unsure?

Size up. A ring that is slightly large can be worn safely until it is resized; a ring that will not pass her knuckle cannot be worn at all.

Is resizing included?

Yes. Every order includes one complimentary resize within 30 days of your ship date. Eternity and contoured bands are the exception, since their design does not allow resizing.

Can I use a ring from her right hand?

Yes, with care. The dominant hand is often about a half size larger, so a right-hand ring may run slightly large on her left hand if she is right-handed.

How long will her ring take to arrive?

Each ring is handcrafted to order and ships in 3 to 4 weeks, then arrives by free, insured express delivery with a signature required.