The ring is 19mm in diameter. However, there is a very easy way to make it fit your finger. The ring is slightly larger than my fingers and hence, I added something inside to make it fit (a small piece of cushion) :)
The best parts is no one can see that cushioning when the ring is worn and it will in no way damage your ring.
The ring will neither rust nor tarnish as there is no coating on the ring.
Only the gold ring will rust :)
hope this helps.
PM me your contacts if you are interested in getting it :)
for more info, click
here.
PS: I got this as a spare so there are no instructions, but then you will still get the password to the forum plus the methods to the 2 routines described, which really isnt too difficult to learn :)