Being surprised with a Diamond Engagement Ring is a magical moment that will never be forgotten. And with a little planning, the event can happen brilliantly.

Below, you’ll find some very easy solutions to getting her ring size while keeping your gift a surprise. Keep in mind that a woman’s ring size will vary for each finger, so the below suggestions are meant only as a directional tool for you.

Make an Impression
If she’s in the habit of leaving any of her rings lying about, make an impression of one. A bar of soap, a piece of clay or even a piece of bread can be used to take a reliable measurement.

Put it in Writing
You could even trace the inside of the ring on a piece of paper which the jeweler can then use to determine an accurate measurement.

Try it on for Size
Simpler still, just put one of her rings on your own fingers. Push it down as far as it will go and then mark the spot with a pen. Then just show the marking to your jeweler who can measure it for you.