I did find the rings. Not exactly what I had in mind, nevertheless nice, quite happy with my purchase. They are very simple silver thin(ish) bands. I bought three, one sits at the top (or bottom? opposite nail anyway), the other two just under my knuckles. Now, I am not sure whether they will last long as the second two slip down a bit now and again… They were really inexpensive though, 9 euros each!!
Perhaps next time I will buy those ones that have a very thin chain at the back which holds them together. I also got the girl in the shop to write down the three sizes for me so, hopefully, I will be able to buy them on-line in the future.