Please see the Bangle Sizing Guide, which provides a good suggestion for the sizes of the torcs to buy. The torcs are in fact a smaller diameter due to the backs being open and do not need to fit over knuckles. However, if you measure your wrist size for a closed bangle, the torc will suit the same S/M sizes:
3.5cm SOLID silver bracelet. This is NOT hollow tubing and due to the weight is hallmarked by the London Assay Office
1mm wire wrap decoration
Distinctly Deco. Product Code: DDB1
A lovely solid silver torc for women with the subtle decoration of a wire wrap to give it that feminine feel.
Many torcs are hollow tubing which means they are very lightweight but might look as if they are a chunky bracelet. This torc has a lovely feel because it's made from round 3.5mm silver (although it's not too heavy that your arm is weighed down unnecessarily!). I originally designed this bracelet in 2006 and only made 5 of them. One I have worn every day since! I have finally relaunched it 7 years later.
If this is going to be purchased as a gift, I have found that unless the woman has very small/ large wrists, then the Medium is generally the 'average' woman in the UK.