I need to buy a gift for a 40th birthday for my Dsis and will have around 350-500 quid budget from the family collection to spend. I would like any suggestions for really good quality, funky but enduring and classy costume jewellery, silver etc. Bangles, gemstone cocktail rings that sort of thing. She's quite fussy and hard to please but has asked for a surprise, and I drew the short straw. 
I've looked at Kit Heath and Georg Jenson so far - any other suggestions?
Thanks muchly.