Hollywood's A-list stars flaunted gold and silver gowns on the Oscar red carpet on Sunday, doused with a generous helping of diamonds, feathers, sequins and symbolic blue ribbons on the world's most cinematic runway.Emma Stone, who took home the Academy Award for Best Actress, sparkled in a 1920s inspired gold fringed Givenchy gown, as "Hidden Figures" supporting actress contender Octavia Spencer opted for a silvery Marchesa adorned with a flounce of feathers.Resembling a real-life - though much more chic - Oscar award, actress Jessica Biel sported a shimmering gold-copper Kaufman Franco beaded gown accessorized with a bold African-inspired necklace from Tiffany's."I call it perfection!" piped in husband Justin Timberlake, wearing Tom Ford."Lion" supporting actor nominee Dev Patel and television host Ryan Seacrest shared fashion warnings about the dangers of wearing white tuxedos jackets on a red carpet filled with women in red lipstick as Dakota Johnson floated by in a flowing gold Gucci.Fashion experts agreed the elegance quotient was high, with nods to "old Hollywood glamour" updated for today."This is a fantastic year for fashion on the red carpet," said InStyle's fashion news director Eric Wilson. "It's unusual to see this many great gowns, each with something unusual that makes it feel like a new look."Diamonds adorned the throat of "Hidden Figures" star Taraji P. Henson, poured into a cleavage-baring midnight blue velvet Alberta Ferretti gown with a daring split at the leg.Velvet ruffles from Oscar de la Renta cascaded down last year's best actress winner Brie Larson in an old Hollywood glamour look with a dramatic decolletage."The velvet is big. That will be a trend continuing in 2017 as we've seen on runways," said Glamour fashion news director Florence Kane.Isabelle Huppert, nominated for best actress for "Elle" showed her typically refined style in a long-sleeved silver Armani Prive gown, while Ruth Negga, also nominated in the same category for "Loving," chose a long-sleeved lacy Valentino in the fashion house's signature vibrant red.Supporting actress nominee Viola Davis poured herself into an off-the-shoulder red Armani, as Charlize Theron went for a metallic look in Dior.Negga and other attendees like model Karlie Kloss added a blue ribbon to their gowns and tuxedos to show support for the American Civil Liberties Union, an advocacy group that worked to get President Donald Trump's travel ban blocked in U.S. courts.