The historic French jewelry house Van Cleef & Arpels is revealing some of its unique techniques in jewelry and watchmaking this summer, from July 17 to 31, in a series of hands-on courses at the Tokyo Station Hotel in Japan. Launched last year in Paris, the L’Écoleprogram was such a big success that the company decided to bring its jewelers, gemologists, and timepiece historians to transport the experience to Japan. The experts will work with just 12 students per class to inform them on gemstones, artisan …