Carrie Underwood The American Music Awards' Favorite Country Female Artist winner donned a peachy-keen thigh-high Yas Couture creation, with a long glittery cape that maximized the appeal of the mini style and glowy rose gold jewels. ON UNDERWOOD Signature irregular diamond outline Femme earrings in 18k rose gold; $17,600; Kimberly McDonald, NYC; 646-205-9994; kimberlymcdonald.com   UNDER $1,500 Almeria earrings with 0.32 ct. t.w. pavé diamonds in rose gold; $1,225; J/Hadley, NYC; 212-868-0065; jhadleyjewelry.com   UNDER $150 14k gold over sterling silver black crystal fancy open abstract drop earrings; $145; Athra Luxe, NYC; 888-532-6023; brittanyc@athra.com; athraluxe.com       Gwen Stefani During a wrenching prime-time performance of her divorce anthem "Used to Love You," the Voice judge gave us full-