Pandora
Pandora uses the standard European sizing system, which is based directly on the ring's inside circumference in millimeters. A Pandora size 54 means the ring is 54mm around.
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Brand Ring Size Charts
Not all jewelers use the exact same scale. While most US brands stick to standard US numbers, European brands often use circumference.
Tiffany & Co.
Tiffany uses the standard US numerical scale (sizes 3 to 13), though their thicker bands often run a quarter-size tight. We recommend trying thick bands in-store.
Cartier
Like Pandora, Cartier relies strictly on the European millimeter circumference standard (e.g., Size 52). They explicitly recommend choosing one size up for their wide Love Rings.
Kay, Zales, & Jared
These major US retailers follow standard US numerical sizes. They generally offer free resizing within a 30-day window if your measurement is slightly off.
Written by Evelyn Moore
Evelyn is a certified GIA Gemologist with over a decade of experience in fine jewelry sizing and design. She ensures all conversion charts and measuring advice strictly adhere to ISO 8653 standards.