On the scene at Mandalay Bay with newcomers, veterans, and JCK lifers             Cyril Magne, a correspondent for the French fashion site Guide Joailliers, was at JCK to explore the U.S. market. “The customers in the U.S. are not afraid of big rings, big pins, and big necklaces on a daily basis,” he observed. “You don’t see that in France.”   Sandi Paccione (l.), of Torrance, Calif.–based Tutima, was excited to “meet some of our peers,” and coworker Kristin Buettgenbach loved “putting so many faces to names of people we work with on the phone.”   Andrew Puddifoot, general manager of Portland, Ore.–based MiaDonna, was enjoying his second year at JCK. “Coming here is really about building relationships and enjoying the scene,” he said.   Westley Jewelers’ buyer M