Determine the perfect ring size: How to measure secretly and accurately

A marriage proposal or a special gift should be perfect – and that includes the ring fitting like a glove. But how do you find out the ring size without spoiling the surprise? At Sirius Diamant, we have over 30 years of experience with happy couples and are sharing our best tips with you here.

The Most Common Methods for Measuring at Home

If you don't have a professional ring sizer at hand, these simple methods can help:

• The Inner Diameter: Take a ring that already fits the person well. Measure the inner diameter in millimeters with a ruler or caliper. Multiply this value by 3.14 (Pi) to get the circumference.
• The String Method: Wrap a piece of string around the thickest part of the finger. Mark the spot and measure the length of the string. The millimeters correspond to your ring size (e.g., 54 mm = size 54).

Secretly Measuring: Tips for a Surprise Proposal

Planning a surprise? Here's how to find out the size without her knowing:

Use a "Borrowed Ring": Briefly "borrow" a ring she wears on her ring finger (left or right, depending on the country!) and trace the inner circle onto a piece of paper.

Friends' Help: Often, a best friend or mother knows the ring size or can subtly bring up the topic on their next shopping trip.

Understanding International Ring Sizes

In Germany, we usually state the size as the inner circumference (e.g., 52, 54, 56). In the USA or England, letters or other numbers are often used. At Sirius Diamant, you will find a detailed size chart to avoid confusion.

What if the Ring Still Doesn't Fit?

No worries! Thanks to our 30-day return guarantee and our ring resizing service, we ensure that everything fits perfectly in the end. As a manufacturer, we can often make adjustments quickly and easily.

Are you ready for the next step? Discover our engagement rings and find the perfect masterpiece.