What’s trending and who’s advertising in the October issuesInStylePushing• Diamond and 18k gold four-prong ear cuff; sterling silver and pearl ear cuff (“A surprising delicateness has appeared in this alt jewelry category”)• Redwood, diamond, and gold earrings; ebony and 18k gold bangle (“The materials sound exotic…but there’s a practical side to these bold pieces.”)Advertisers Cartier, Bulova, Honora, Robert Lee Morris, TacoriHarper’s BazaarPushing• Crystal-studded brass bug brooch; diamond ­bouquet ring with leather flowers (“Noir Nature”)• Metallic sapphire brass stud ring; blue sterling and silver diamond-shape earrings (“Dive Into Blue: Cobalt adds energy…to fall wardrobes”) Advertisers Bulgari, Dior Watches, JB Star, Bulova, Chopard, Roberto Coin, Ebel, Rolex, Van Cleef & Arpels, ­Audemars Piguet, TAG Heuer, Hublot, Michele, Le Vian, He