There was a moment in Las Vegas when I knew the JCK show’s much-hyped move to Mandalay Bay had succeeded. It didn’t occur during a show appointment, nor at one of the many dinners I attended over the course of my weeklong stay. True to the trade’s hard-partying reputation, it happened on the dance floor.After Bruno Mars’ performance on the beach at Mandalay Bay on Sunday night, my friends and I made our way to eyecandy, the late-night DJ lounge in the middle of the casino floor. As I surveyed the exuberant scene—jewelers of all ages, styles, and persuasions shaking it to a series of infectious hip-hop beats—I was struck by the relaxed, easy, genuinely cheerful vibe that permeated the room. In one direction, I spotted Michael Schechter, our Jewelry 2.0 columnist, ­grooving to the music with a big, happy grin on his face. In the other direction, there was Desiree Hanson, direc