All necklaces, bracelets & anklets are measured in centimetres. The most accurate way to measure the correct size is to use length of string or measuring tape & measure it to the correct length around your neck for necklaces. For anklets & bracelets the same can be done however making it a firm measure with no slack. I will allow an extra few centimetres for room.
For further queries please contact me at firstname.lastname@example.org