On a recent birthday, we were at the jewelry counter at Herrodd's, with three hundred pounds in our pocket, and we chose not to buy anything because we knew we'd prefer whatever Karin Jacobson cooks up next. From cocktail rings to commitment rings, Jacobson's bodacious baubles combine design mastery with a youthful affinity for toy rockets, oversized gemstones, bugs, etc. And Jacobson works largely in silver and in lab-grown stones. This means her prices stay low. With a clean conscience and a shimmering finger, you'll be the envy of the catwalk.