How to Buy Moissanite as a Gift Without Knowing Her Ring Size

August 25, 2026

You've found the perfect moissanite ring. You know she'll love it. There's just one problem: you have no idea what size to order. This is one of the most common challenges for anyone buying an engagement ring or jewelry gift as a surprise — and it's completely solvable. Here's everything you need to know about buying moissanite without knowing her ring size, from secret sizing tricks to our free resize policy.

The Good News: Ring Size Is Not a Dealbreaker

Before we get into the tactics, the most important thing to know is this: ring size is not a dealbreaker. Our free resize policy means that if the ring doesn't fit perfectly when it arrives, we'll resize it at no charge within 30 days of purchase. The proposal can happen on schedule, the ring can be worn for the moment, and the perfect fit can be achieved afterward. Many couples do exactly this — and the resize appointment becomes a sweet second chapter of the engagement story.

Secret Sizing Tricks: How to Find Her Ring Size Without Asking

1. Borrow a ring she already wears: If she wears rings on her ring finger (left hand, fourth finger), borrow one while she's sleeping or away and bring it to a jeweler to be sized. This is the most accurate method. Take a photo of the ring on a ruler for reference.
2. Trace the inside of a ring: Place one of her rings on a piece of paper and trace the inside of the band. Bring the tracing to a jeweler or use an online ring size chart to estimate the size.
3. Ask her friends or family: Her best friend, sister, or mother may know her ring size — or may be willing to find out discreetly on your behalf.
4. Pay attention to her hands: If she has slender fingers, she likely wears a size 5–6. Average fingers typically wear a size 6–7. Larger hands typically wear a size 7–8. This is a rough estimate, but it can help you choose a starting size.
5. Use a ring sizer while she sleeps: A plastic ring sizer (available online for a few dollars) can be gently placed on her finger while she's asleep to get an accurate measurement.
6. Ask her directly — creatively: Some buyers find a creative way to ask without spoiling the surprise — "I'm buying a gift for a friend, what size do you think she'd be?" or "I saw this ring online, what size do you think you'd wear?"

The Average Ring Size: A Starting Point

The average ring size for women in the United States is size 6 to 6.5. If you have no other information to go on, ordering a size 6 gives you the best statistical chance of being close to the right size. Our free resize policy means that even if you're off by a size or two, the fix is easy and free.

The Placeholder Ring Strategy

Some buyers choose to propose with a placeholder — a simple, inexpensive ring that represents the commitment while the "real" ring is being selected together. This approach has several advantages: it eliminates the sizing problem entirely, it allows her to be involved in choosing the final ring, and it removes the pressure of getting every detail perfect for the proposal moment.

If you choose the placeholder approach, consider a simple moissanite solitaire in a standard size as the placeholder — it's beautiful enough to be meaningful in the moment, and the upgrade to the final ring becomes a shared experience.

Our Free Resize Policy

All Moissanite Shine rings can be resized free of charge within 30 days of purchase. Simply contact us at our contact page after the proposal to arrange the resize. We'll provide a prepaid shipping label and return the resized ring within 5–7 business days.

Note: Some ring styles — particularly eternity bands with stones all the way around the band — cannot be resized. If you're buying an eternity band as a surprise, getting the size right is more important. In this case, we recommend using the borrowing or tracing method described above.

Practical Tips for the Surprise Buyer

✅ Order a size 6 if you have no other information — it's the most common size.
✅ Borrow a ring she wears on her ring finger for the most accurate sizing.
✅ Remember our free resize policy — the proposal doesn't have to wait for the perfect size.
✅ Consider the placeholder approach if sizing feels too uncertain.
✅ Keep your purchase receipt for insurance and appraisal purposes.

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