Jewelry

Jewelry can really play up an outfit!
But too much jewelry can be distracting, and you don't want that when your meeting new clients.

Earrings that accent the face, such as simple studs or hoop earrings. You don't want to wear anything that are too flashy, save that for the night out on the town.
You want to wear rings that are modest, if your married wearing your wedding band is okay. You don't want anything to gaudy.
Same goes for necklaces, wearing a necklace that could get caught in the desk drawer when you bend down to open it is probably something you don't want to risk happening.
Watches, well I love watches and I love the real fancy ones, but sometimes they can be too distracting. Wearing a watch that has some diamonds is okay :)