249 Worth Ave., Palm Beach, Fla.Historic Worth Avenue is home to more than 50 jewelers, so standing out among the crowded Palm Beach luxury market—which includes such coveted brands as Van Cleef & Arpels, Cartier, and Tiffany & Co.—requires some unconventional thinking. In 2009, in the aftermath of the Bernie Madoff affair and the accompanying market downturn that affected the purchasing power of many consumers in this coastal enclave of wealth, Abhishek “Abby” Patni opened A.R.T., his jewelry salon with a conspicuously hip twist. Contemporary jewels and art pieces appear on an ever-changing and expertly curated display, making clear why this newcomer is such a welcome departure from the avenue’s tradition.ART OF THE DEALSouth Florida–bred, University of Florida–educated Patni, born in Jaipur, India (“The city of jewels,” he says), was looking to return to his a