Trick 1: "Deceive Heaven and Cross the Sea" while she's asleep
If your girlfriend isn't a light sleeper who wakes up at the slightest disturbance, then this is your golden opportunity!
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Steps:
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Prepare a non-elastic thin cotton thread, a strip of paper, or the "twist tie" commonly used for bread bags (the twist tie holds its shape best, never use elastic string).
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While she's in a deep sleep, gently pick up her left ring finger.
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Wrap the twist tie or cotton thread around the widest part of her finger (usually the knuckle), mark the joint with a pen, or twist the tie firmly to secure it.
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Discreetly put it in a hard box and take it to a jewelry store the next day for the staff to measure.
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⚠️ Friendly reminder: The size of a person's finger can vary in the morning and evening, or when swollen. If possible, it's recommended to measure one or two more times and take the average.

Trick 3: Use an existing ring
Does she usually wear rings? The perfect opportunity to act is when she's showering, sleeping, or leaves the house without wearing her ring.
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Steps:
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Method (Drawing method): Place the ring flat on a ruler and measure its inner diameter. Then compare it to ring sizes.
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⚠️ Friendly reminder: Make sure the ring is one she usually wears on her "ring finger"! If it's worn on her index or middle finger, the size will be too big.

Trick 4: Send in a "double agent" bridesmaid
Women's intuition is often sharp; if the guy asks, the secret is out, but it's different when a good girlfriend steps in!
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Steps:
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Choose a "top-secret bridesmaid" who is extremely discreet and a great actress.
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Have the bridesmaid pretend she wants to buy a ring or shop for jewelry online, and drag your girlfriend along to browse and try things on.
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While shopping, the bridesmaid can naturally say: "This one is so beautiful! Why don't you try it on? Your hands look so delicate, what size do you wear?"
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After subtly extracting the answer, the bridesmaid can secretly report back to you.
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⚠️ Friendly reminder: You must confirm that this bridesmaid won't "accidentally spill the beans," otherwise the surprise plan will be ruined in an instant.

Trick 5: Use technology to "smartly crack the code"
If you can briefly get your hands on her ring, but don't have enough time to go out or draw, then let your phone help!
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Steps:
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Download an app specifically designed for measuring ring sizes (e.g., Ring Sizer).
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When she's not looking, place her ring flat on the phone screen.
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Adjust the virtual circle on the app until it perfectly aligns with the inner circumference of the ring.
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The screen will immediately display sizes such as international and US sizes. Take a screenshot and save it!

The five tips above are for your reference. We wish you great success with your proposal plan, discreetly planning a romantic surprise to secure a lifetime of happiness!