FREE Ring Sizer from Blue Nile
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https://www.bluenile.com/education/rings/find-your-ring-size?keyword_search_value=ring+size
Click "Get it For Free"
NOTE: Do not add to basket or it will charge you.
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I got this as a freebie from them years ago. Nice thick plastic, easy to use and read, and accurate. Totally worth it.
