Jewellery recommendations

My mum has expressed an interest in getting some jewellery for Christmas. She likes silver necklaces (rather than pendants and chains), quite modernish, a bit funky looking, not really those celtic designs they have. Unfortunately, the only other thing is that I will know when I look at it if she'll like it, but can't describe it. Does anyone know any reasonably priced online shops I could look at? Or some physical shops in Edinburgh would also work well!