Free Blue Nile Ring Sizer!

Get Our Ring Sizer Tool
For a better fit, request a plastic ring sizer be mailed to you.
The Perfect Fit (Measuring Your Finger)
Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle.
Finger size changes depending on the time of day and the weather. For best results measure your finger size:
At the end of the day and when your fingers are warm (Fingers are smaller in the early morning and when cold.)
Measure finger size 3 to 4 times to eliminate an erroneous reading.
Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.
Common Ring Sizes
Women’s rings typically range from size 3 to 9. The most commonly purchased women’s ring sizes at Blue Nile range from size 5 to 7. Size 6 is the most popular ring size.
Men’s rings typically range from size 8 to 14. The most commonly purchased men’s ring sizes at Blue Nile range from size 8 to 10-½. Size 9 is the most popular ring size.
Free Resizing
Blue Nile provides complimentary resizing for Build Your Own Rings®, and Diamond Bands when within the manufacturer's recommended sizing range, during the first year. Simply contact a Diamond & Jewelry Consultant at 1-800-242-2728 to arrange for your free resize. You will be responsible for the cost of returning the product, according to our return policy.
Diamond and gemstone eternity rings with a specific number of gemstones per finger size; milgrain or ornate bands, some silver rings, or rings with alternative metals such as Tungsten cannot be resized. We are happy to exchange your ring for another size within 30 days of purchase. It is important to note that should you opt for an exchange, your new ring may contain fewer or more gemstones, diamonds, or a reduction or increase in precious metal weight which may cause an increase or decrease in the price.
Please note that some of our rings cannot be resized due to their design. In these cases, an icon will appear on the product detail page under the ring size selection.
International Size Conversion
View our free Ring Size Guide PDF to see the International Ring Size Conversion Chart on the second page before placing an order outside of the U.S. or Canada.