Our favorite is this first necklace from Jacob the Jeweler. If I got this one made, we couldn't do the giant rocks of diamonds and instead would do a cluster of smaller ones. It didn't have a matching earring but we think we can design something to go along with it.
Cartier Necklace and earrings are also beautiful

Random necklace I saw somewhere but I tend to like this teardrop shape. Only thing is that I don't think I'd want a colored stone and I think thats sort of what makes this style necklace work.