If you're not planning on spending much, your best bet is this Rosa Maria Pendant. It's a popular piece, while not very expensive. Another nice option is this Isabel Marant Pendant. While the price is rather reasonable, be sure that this product will become a wonderful addition to your wardrobe. Or you can opt for this Pamela Love Pendant. This item has all the potential to become a powerful player in your wardrobe.
For something in the middle of the price range, why not consider this E.m. Pendant. While the price is very reasonable, this product is an easy wardrobe update. It's also worth considering this Saint Laurent Pendant. This product is ultra popular and, just as importantly, not very expensive. Take a look at this Astley Clarke Pendant too! Great value for your money.