I really love the swallow one, it's so pretty 
Enchanted I'm not personally keen on but it's the sort of thing your friend might love?
The Meadowgrass one is a bit plain.
The Peacock one is also lovely, but the swallow one is stunning and would get lots of compliments.
I was in Fenwick on Bond St earlier looking at bracelets - I have a thread on here canvassing opinions for my pressie from DH - and I was admiring the Alex Monroe stuff. They had lots of other designers with unusual rings, worth a look if you're near London?