1221 Sixth Ave between 48th and 49th Sts, suite 4200. Subway: B, D, F, M to 47–50th Sts–Rockefeller Ctr. Sparkly baubles are discounted at this one-day blowout. Sterling-silver hoop earrings are halved from $90 to $45, gold-plated link bracelets are $75 (were $200), and black diamond necklaces are priced at $300 (usually $400). Grab some cash—credit cards are not accepted.