If you're in a thrifty mode, this EFFY Pendant will fit the bill. It's a foolproof choice, while not very costly. Another nice option is this Betsey Johnson Pendant. It's an item you'll fall in love with which also doesn't cost the earth. Or you can choose this Pendant - be sure you'll be making a stylish addition to your wardrobe.
If you want to treat yourself, then what you're looking for is this Bloomingdale's Pendant. It's more expensive but worth your money. While you're at it, also have a look at this LeVian Pendant. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious LeVian Pendant? Yolo, right?