Diane Kruger dazzled when she waltzed into the Met Gala this past September. The German actress and model arrived in a lime green gown with a train and cut-outs that showed off her abs, searing bright-pink eyeshadow and a gargantuan engagement ring with a square-cut diamond as big as the Ritz.After years of subtler sparklers and sweet, semiprecious stones, Kruger’s show-stopping rock threw down a gauntlet. Brides — weary of COVID-era austerity and caution — are embracing the big, bold and brilliant.