as reported by our fine jewelry expert, Amy Elliott

Ruth Negga - Irene Neuwirth x Gemfields

Total Tonal Perfection: To complement her high-necked red Valentino gown, the best actress nominee chose a pair of statement earrings and an incredible headpiece, both made of Gemfields-sourced rubies from Mozambique and designed by Irene Neuwirth. A memorable "grand finale" to Negga's many shining red carpet moments this season.  

Nicole Kidman - Harry Winston

The glistening embroidery on her Armani Privé gown begged for major diamonds and the best supporting actress nominee gave the honors to master jeweler Harry Winston. Her pear-shaped diamond earrings also incorporated spinel, a stone with pinkish red tones, which brought a compelling pop of color to her look - further enhanced by her immaculate red lip.

Jessica Biel - Tiffany & Co

Golden Girl: Biel dazzled the crowd in a glamorous KAUFMANFRANCO gown with the only accessory that could possibly hold up to all that magnificent, 360-degree shine: the Tiffany & Co 'Whispers of the Rainforest' statement necklace featuring diamond baguettes and 18k gold palm fronds.

Charlize Theron - Chopard

It was a night of many necklaces, but not for this red carpet goddess who turned heads in a pair of mismatched mega earrings. The earrings featured more than 50 carats worth of pear and heart-shaped diamonds by Chopard.

Karlie Kloss - Nirav Modi

Chokers dominated the red carpet this season and for the Oscars it was Karlie Kloss who "modeled" the trend best. She topped her white Stella McCartney cape dress with a wide diamond choker by Nirav Modi, featuring a lacy, airy and delicate floral motif. The jewelers' en tremblant diamond earrings were the perfect finishing touch.