All eyes were on Lady Gaga as she wore a necklace with the historic, cushion-cut brilliant Tiffany Diamond weighing 128.54 carats unearthed in 1877, which has an astounding 82 radiant facets. 

Sarah Paulson was a picture of perfection wearing a Harry Winston Guipure Diamond necklace set with 55.7 carats of diamonds, and Round Brilliant Micropave Earstuds also by Harry Winston. 

A dashing Rami Malek had on a Cartier Tank Américaine watch and Santos de Cartier cufflinks. 

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Charlize Theron looked ever so chic wearing pieces from Bulgari's Serpenti high jewellery collection—a high jewellery Serpenti necklace with over 75 carats, and earrings with 25 carats of sapphires.

Olivia Colman got our thumbs-up as she stunned in Chopard Haute Joaillerie earrings set with over 14 carats of diamonds, and a ring from the brand’s L’Heure du Diamant Collection. 

Amy Adams decided to go vintage wearing a few pieces from the Cartier Collection produced in the 1930s, matching it with a Cartier high jewellery tennis necklace and ring. 

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Helen Mirren was a vision in a suite of Harry Winston jewellery from the maison's beloved Winston Cluster collection.

Michael B. Jordan did not shy away from the bling as he wore a diamond-studded Piaget Polo watch, which he matched with earrings from Piaget's Limelight Collection and a Piaget Possession ring.

Miley Cyrus was owning her edgy glam look in Bulgari, wearing the maison's signature high jewellery Serpenti necklace set with 23 emeralds and pave diamonds, which she matched with Bulgari chandelier diamond earrings.

Bradley Cooper rocked his tux with an IWC Big Pilot’s Watch.

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Impeccable selection by actress Michelle Yeoh, choosing to wear a suite of jewellery from Chopard’s Haute Joaillerie Collection. 

Emma Roberts kept it simple but stunningly elegant with a Forevermark by Rahaminov Diamonds choker, a Forevermark Five-Stone Flower diamond ring, and Forevermark Alchemy Collection by Jade Trau drop earrings.

Constance Wu was a breath of fresh air, choosing to wear a suite of bespoke jewellery by Atelier Swarovski Fine Jewelry.

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Regina King looked immaculate in a set of diamond high jewellery from Chopard's Haute Joaillerie Collection. 

See also: 15 Best Dressed Celebrities At The Oscars 2019