Simple black heels and sleek black clutch. I would go with stud or slightly drop pearl earring, and a up do. Personally, I wouldn't wear a necklace. I never like them with that neckline. And I would maybe do a bracelet.
I try to follow the rule of Coco Chanel. Whenever you put jewelry on, take one piece off before you walk out the door. I always end up getting annoyed and taking one piece off anyway. It's better to leave it at home rather than throw it in my bag.