For retailers, 2015 will be all about reinvention: ­transforming themselves into media outlets, manufacturers, and even diamond buyers. herewith, 10 hot ­topics that jewelers will be buzzing about all through the new year.WearablesApple chose an intriguing venue (and time) for one of the first public viewings of its new smartwatch: the high-end Paris boutique Colette during fashion week. Equally intriguing was the guest list: Chanel designer Karl Lagerfeld and Vogue editor Anna Wintour. The upshot? The tech giant wants its more-than-a-timepiece viewed as not just a gizmo, but also a piece of fashion. And it’s not alone. Online retailer Gilt.com just released a smartwatch by menswear designer Michael Bastian; Rebecca Minkoff has created two smart bracelets with Case-Mate (one notifies you of calls and texts, the other charges your phone); retailer Opening Ceremony partnered with Intel