Sizing rings an be a little bit tricky – especially when working across the internet.
Every jeweller does things ‘their way’ – and those ways don’t always line up, jeweller-to-jeweller.
There are a ton of different ring measuring systems depending on where you live. Thankfully, there are handy charts like this one that allow jewellers like me to convert from one system to another.
Our tools are also different. Every jeweller has their own tools, manufactured in different places all over the world. Sometimes, this can mean that one jeweller’s tools are very slightly different from another’s. I am in Australia, but my tools actually have US measures on them, which means we need convert Aussie sizes to US before we can make rings.
It’s for this reason that we recommend that all our customers go to a couple of different local jewellers to get their ring size. If you can get 2 different jewellers who agree on your size, you can be pretty confident that it’s the right one!
Any other method – like using an online sizer, one you print out, or even a bit of string or tape around your finger are never going to get you an accurate size. The only way to be sure you’re getting the right size is to have a jeweller professionally size you in-person. Thankfully, any jewellery store will do this for free, and it takes just one or two minutes. It’s definitely worth the effort in the long run to get the size right, first time!
Size differs depending on the width of the ring you order, too. Jewellers can use either a thin or a wide set of sizing bands.
The width of your ring affects the fit.
Wider rings need to be larger than narrow ones to feel comfortable.
It’s for this reason that I always make any ring larger than 5mm between 1/8 and 1/4 size bigger, depending on the info you give me about how you got sized.
There are also 2 different methods for sizing rings depending on where they sit on the jeweller’s mandrel.
The first one is the centre line method. Using this method, the size is read depending on where the middle of the ring sits on the mandrel.
The second one is the true diameter method. This is read by where the bottom of the ring sits on the mandrel.
I use the true diameter method, because I believe it gives a more accurate size, as ring sizes can also be measured using inside diameter – and the point where the ring and mandrel connect is the bottom edge of the ring, not the middle.