They came, they saw, they shopped. For the LUXURY and JCK Las Vegas shows, Year Five at Mandalay Bay went off without a hitch. Meanwhile, the Diamond Empowerment Fund’s Diamonds in the Sky gala brought jewelers, students, and celebrities to Vegas.     LUXURYTacori’s Paul Tacorian tells the brand’s retail partners that 60 percent of Tacori.com’s online traffic comes from mobile devices. LUXURYJCK’s Lars Parker-Myers and W’s Claudia Mata (far r.) with Design Center Editor’s Choice Award finalists Marcia Budet, Anita Sondore, and Arya Esha LUXURYBen Bridge Jeweler’s Lisa Bridge and Ed Bridge flank Amir Goldfiner from Rahaminov Diamonds. JCKForevermark’s Charles Stanley with De Beers’ Philippe Mellier and Stephen Lussier at the “Diamond Insights” panel discussion RINGS OF STRENGTH MJSA’s Peggy Jo Donahue, GIA’s Craig Da