So the fitted rings go as low as a 5. Lucky for me, the quill ring I wanted is adjustable!! Since it wraps around your finger, it can be squeezed to get a bit tighter. They didn't have my ring to try on, but I tried on a similar one and it worked great!
(I also got this:
http://shop.stelladot.com/style/b2c_...-necklace.html)