A growing number of Western luxury retailers are gearing up to celebrate the 15-day Lunar New Year holiday that starts Feb. 10, with new products like Bulgari's $400,000 diamond and jade Serpenti necklace to commemorate the Year of the Snake. Bergdorf Goodman in New York has added Mandarin speakers to serve the expected spike in Chinese shoppers, and Harrods in London will sell snake-emblazoned gold bullion bars.