All of the sizes listed on The Vintage Jewellery Co. are in Australian measurements. 

While we are able to provide a resizing quote, we typically recommend having your ring sized in person at your local jeweller to ensure the best fit.
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How to measure your finger size:

1) Wrap a piece of string around your finger.
2) Marking the place where the string overlaps itself.
3) Unwind the string and measure it's length.
4) The length of the string will be your fingers circumference in millimetres.