I need to buy a cheapo bracelet or earrings for a birthday (£25 max) but don't want to present an Elizabeth Duke-type box. You know what I mean! 
I'm in Cheltenham. The independe jewellers didn't have anything nice for that money (would anywhere?!)
Is H Samuel too down-market? Are there any high street, chain jewellers which would be ok?
Sorry, I'm totally ignorant about jewellery. I always have it on my birthday and Christmas lists, so never buy any more myself!