Do toe rings come in different sizes and is there a rule so to speak of which toe to wear them on?

I was wanting to do something different with the approaching spring. I always get my sandals out, but was wanting to add a toe ring. I have never worn one persoanally, so was wondering if they come in different sizes and I'd there a rule if thumb as far as which toes or toe to wear them on. Researching for the warm season, and thinks in advance.

Do toe rings come in different sizes and is there a rule so to speak of which toe to wear them on?
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