I think David Yurman makes the best men's jewelry based on the high quality craftsmanship, the large diverse selection, and the unique and exotic metals and stones they use.
Exotic Stone Collection
Streamline Collection
Waves Collection
Armory Collection
(this bracelet reminds me of Sauron's armor..)
Maritime Collection
Ironwood Collection
Various Dog-tags inlayed with exotic stones
Window display at the Houston Galleria David Yurman
Turquoise Spiritual Bead Necklace