915 Broadway between 20th and 21st Sts, suite 903. Subway: N, R to 23rd St; 6 to 23rd St. Designer baubles are 60 to 80 percent off at this special-occasion-jewelry showroom. Highlights include Erickson Beamon gunmetal chandelier earrings for $96 (were $478); Kara Ross faux-snakeskin bangle trios, cut from $260 to $52; and Lizzie Fortunato braided-leather bracelets tagged $52 (normally $207).