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Rings are the trickiest type of jewellery for sizing, and it's a good idea to get your size right before you purchase any ring, especially an expensive engagement or gemstone ring. Otherwise you will end up having to get it resized which can leave a mark as it has to be cut and re-joined. So before you buy or order a ring, follow this guide on how to accurately measure your ring size.
First of all, you need to be sure of which finger you want the ring to go on as obviously your fingers will be different sizes. You'll also want to choose which hand it will go on, as even the same finger on opposite hands can vary slightly in size, enough so that the ring could fall off or not be able to get on the matching opposite finger.
Once we have selected the finger, get a thin piece of string or dental floss and wrap it around the finger where the ring will go. Mark where the string meets itself in the circle and measure the length with a ruler. This will be your inside circumference size.
Keep in mind that your fingers change in circumference throughout the day, so it's a good idea to measure your finger at different times. For instance, when you're cold and inactive, your finger size will be smaller than when you are warm and busy.
Better yet, you can purchase a set of ring sizers whereby you simply try on each template until you find the right size. This is probably the most accurate way of doing it at home.
You can also get plastic tape sizers, which wrap around the finger, and these are probably the cheapest of the specialist sizing tools that you can purchase. If you're looking for a free option, there are printable ring sizers, and you can find more information about that here https://www.jewelry-secrets.com/Blog/free-printable-ring-finger-size-chart/
If you already own a perfectly fitting ring, you can also confirm your ring size with a sizing rod by sliding the ring down the rod, while keeping level, until you reach its end point. This will be the ring size.
But what about if you want to buy the ring as a surprise gift or for a proposal? You really need to get your sneaky game on here to keep her (or him) from knowing what you're up to. Firstly, check if she wears any rings and use those as a template. This probably won't work if you're trying for a surprise proposal as most women don't wear a ring on the wedding finger until they are engaged. So, you're going to have to get creative! Perhaps she a deep sleeper, so one day when her hand is dangling out of the bed you could grab some string and give it a go! If she wakes up, have something ready to put in her hand as a back up and distraction.
Another good sneaky way is to talk to one her her friends. Maybe she or he could convince her to go ring shopping, just to window shop and have fun, and your hired spy could find out this crucial piece of information for you. This would be especially good if she thought this friend might also be getting engaged, to keep it realistic, so choose the friend carefully.
If all else fails, and you still can't figure out the ring size, you may have to let her on to your romantic plans, and then head into your local jeweller to find out, and this is probably the most accurate way to do it, so at least there is an important advantage to forsaking the surprise.