The rings sold at Tina Tang were pretty tame—cocktail rings are supposed to be garish, not subtle—except for the shiny sterling-silver “Starburst.” Its bulbous, jutting rods looked like a spiky sea urchin—a cute, albeit young look. Even though the cheap price tag was tempting, I could already see the ring tarnishing at the bottom of my jewelry box. 49 Greenwich Ave., at Charles St.; 212-645-6890.