Same. Duty-free shops refer to shops that are approved by the General Administration of Customs and authorized departments to set up sales places and supervised warehouses that meet the requirements of customs supervision and store duty-free goods, and sell and supply duty-free goods to specific targets. Therefore, Tiffany diamond rings and counters in Korean duty-free shops are the same. Tiffany is an American jewelry brand. 1837, the first Tiffany boutique opened in new york. 1837, the first Tiffany boutique opened in new york.