From Kyōdō News 共同通信社, by way of Japan Today ("Tiffany jewelry thief suspected in Taiwan heist"):

"A jewelry thief who stole at least four rings in Japan last month is suspected in the theft of two rings from a De Beers store in T'aipei 台北 on Tuesday...An Asian man who spoke broken English made off with two rings, valued at NT$10.5 million (about U.S.$330,000/¥30.18 million) and NT$1.85 million (about $58,000/¥5.3 million), after trying on the rings at the store, located on the second floor of Taipei 101 台北101, a skyscraper in the island’s capital...The thief said he was shopping for a wedding ring for his sister and ran off with the rings after the clerk handed them over for the man to inspect...The theft resembles a Dec 31 incident in Japan involving a similar-looking man who ran off with four rings valued at about $500,000 (¥45.6 million/NT16 million) from a Mitsukoshi 三越 store in Tōkyō 東京...Security camera footage of the two incidents...confirm(s) the resemblance...Taiwanese police officials are working with their Japanese counterparts to track down the suspect."