Jewlery

I dont know where to look for my jewlery. I know I want a sizable choker style necklace with either crystals or onyx (havent descided yet) I bough one on ebay with the onyx but it hangs to low so i dont want to go the ebay route again. Does anyone have any ideas?

Im not going to be wearing any jewels in my hair so thats why I want to go heavy on my neck. If anyone has any pics and or places that they recomend that would be fantastic.