How to Find Your Partner's Ring Size (Without Them Knowing)

Getting the ring size right is one of the trickiest parts of planning a surprise proposal. Here's the good news: there are many sneaky (but ethical!) ways to find out, and even if you're slightly off, most rings can be resized.

Method 1: Borrow an Existing Ring

This is the most accurate method. If your partner wears rings, borrow one they wear on their ring finger (left hand, fourth finger). Take it to a jeweler for measuring, or trace the inside circle on paper.

Method 2: Enlist Help

Ask a close friend or family member to help. They could:

• Suggest trying on their own rings "for fun"
• Go ring shopping together for a "different occasion"
• Casually bring up ring sizes in conversation
• Borrow a ring on your behalf

Method 3: The String Trick

While your partner is sleeping, gently wrap a thin piece of string or paper around their ring finger. Mark where it overlaps and measure the length in millimeters.

Note: This method is less accurate because you can't account for knuckle size. Use it as a backup option only.

Method 4: Just Ask (Modern Approach)

Many modern couples discuss engagement beforehand. If you've already talked about getting engaged, simply asking their ring size doesn't spoil the surprise of when and how you'll propose.

Thailand Ring Size Conversion Chart

Thailand commonly uses both US and Asian sizing. Here's a quick conversion:

Thailand-Specific Tips

• Humidity affects finger size: Fingers swell in Thailand's heat. Measure at room temperature, not after being outside.
• Time of day matters: Fingers are typically larger in the evening than morning.
• Most Thai jewelers can resize: Buy close to the correct size—most rings can be adjusted 1-2 sizes up or down.
• Average women's size in Thailand: US 5-6 (but always verify for your partner)

What If You Get It Wrong?

Don't panic! Most engagement rings can be resized by a professional jeweler. When buying, ask about the store's resizing policy. Reputable jewelers like GlitzJewelry.com typically offer one free resize within the first year.