The two-stone concept works in jewelry when the pairing has logic - when the two stones relate to each other rather than simply sharing space. Here Rachel Zoe uses a heart-shaped CZ and a pear-shaped CZ in blue, the pear shape echoing the tapered base of the heart above it. The result is a pendant that reads as a considered design rather than two stones happening to coexist on a chain. Set in 14K gold over sterling silver on a 16-inch cable chain with a lobster claw clasp and extender, the chain length hits at or just above the collarbone depending on the wearer - the right landing point for a pendant with this kind of color presence. The blue CZ catches light without demanding attention; this is a color piece that works with a wardrobe rather than against it.