Identify several themed communities where your potential buyers might be found. Here's a list of suggestions for fashion & jewelry shops:
Make beautiful collages that include your items for sale and your shop's logo. Follow and like other members' creations, participate in competitions, and get yourself noticed.
Two great fashion fan communities. If you are a fashion enthusiast yourself and love to dress up, then this is your chance to showcase your outfits and simultaneously promote your shop.
This is a platform where people ask for advice on where to find certain fashion pieces. Search the feed for items similar to what you sell and post your suggestions. Great way to generate highly targeted traffic.