If you're a thrifty shopper, your best bet is this Lydell NYC Necklace. It's a terrific piece, while not very expensive. Another wonderful option is this Alexis Bittar Necklace. While the price is not too high, be sure that this item will become a great addition to your wardrobe. You might also want to consider this Freida Rothman Necklace. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're gonna splurge, then what you're looking for is this Alor Necklace. It's more expensive but worth your money. While you're at it, also have a look at this Konstantino Necklace. Yes, this item is expensive, but it does not mean it's not worth it.