1. TrendsSubtle, understated ­jewels were the standouts in ­collections unveiled at the 2014 Las Vegas shows. The lean geometry of Jane Taylor’s metal ­silhouettes and baguette gemstone cuts resonated with fans of restrained design, while classic yellow gold pieces at Rina Limor and ARA Collection proved the eternal appeal of pure, unadorned metal. Also of note: the continuation of negative space, Art Deco, morganite as the new opal (though opal is still going strong!), as well as wing motifs, star and crescent silhouettes, and fringe detailing. Not everyone opted for understatement, however. Judging by the bonanza of ear and hand jewelry on display, conspicuous consumption is alive and well.2. BillionairesNot many couples can say a world-famous billionaire helped them get engaged. During Warren Buffett’s annual stint manning the counter at Borsheims, his Berkshire Hathaway–owne