If you're going to invest in any jewelry this year, then my recommendation is to go for classic pieces that are work-appropriate enough to wear from 9-5, but also still stylish from 5-9. (Not that I know anyone who actually leaves the office at 5pm, but you get the point.)
Anyway, my point is not to endorse work life balance (still working on that one...), but rather, to suggest some great working girl staples. So, you'll look like a boss in the boardroom. Without breaking the bank.
My suggestions: Noelle Pendant ($125), Pointed Stud ($250), Multi-hammered Bracelet ($58) and Fabrice Pendant ($140). hatchjewelry.com.