Kick back with one or more of the titles on our essential reading list for jewelersCaught up in the day-to-day duties of retailing, it can be easy to lose sight of the fact that, as a ­jeweler, you’re selling one of the world’s most culturally significant art forms, boasting a history that unfurls all the way back to early man.Can you envision Cleopatra without that glittering gold headpiece? Coco Chanel without a mess of long pearl strands? Or ­Jennifer Lawrence as The Hunger Games’ tenacious Katniss Everdeen without her gold Mockingjay pin?Jewelry has defined both eras and icons. And