We love a princess-cut diamond and a white gold halo setting as much as anyone. But when it comes to bridal jewelry, why not think outside the (ring) box?      Frame Game Chevron Frame ring in 18k gold with 6.18 ct. pink tourmaline and 2.33 cts. t.w. diamonds; $36,000; Erica Courtney, Los Angeles; 323-938-2373; ericacourtney.com  Loop Mentality  Rose Ribbon ring in 18k rose gold with white diamonds; $2,200; Graziela Gems, Highland Park, Ill.; 773-619-3999; grazielagems.com Band Goods  18k white gold ring with 2.44 cts. t.w. pink sapphires and 1.48 cts. t.w. tapered baguette and round diamonds; $11,735; Supreme Jewelry, Montrose, Calif.; 213-629-0360; supremejewelry.net  Thin Cycle Ring in 18k yellow gold with a 0.31 ct. tapered baguette diamond; $3,400; Nora Kog