Oscar winners Matthew McConaughey, who won the lead actor award for Dallas Buyers Club, and Cate Blanchett, who won the lead actress award for Blue Jasmine, both wore Chopard to the event.

Oscar winners Matthew McConaughey, who won the lead actor award for Dallas Buyers Club, and Cate Blanchett, who won the lead actress award for Blue Jasmine, both wore Chopard to the event.

Blanchett’s 18-karat white gold earrings by Chopard featured 62 white opals totaling 33 carats. 

McConaughey wore Chopard’s 18-karat white gold  L.U.C. XP Tonneau timepiece and a pair of 18-karat white gold, onyx and diamond cufflinks. 

E! host Giuliana Rancic accessorized with Forevermark’s 18-karat white gold and diamond marquise-shaped ring.

Actress Laura Dern donned Brumani’s “Looping Shine” diamond and crystal rings. Her father, Bruce Dern, was nominated for a lead actor Oscar for his role in Nebraska.

Margot Robbie of the Oscar-nominated movie The Wolf of Wall Street wore a Forevermark diamond necklace.

Idina Menzel, who voiced Elsa in Frozen, which won the Oscar for best animated feature film, wore Demarco’s diamond earrings.

Jennifer Garner, who was in Dallas Buyers Club, wore Forevermark’s  platinum and diamond bracelet by Rahaminov, and fancy yellow diamond ring by Maria Canale for Forevermark.

Karen O of the Yeah Yeah Yeahs wore Stephen Webster’s 18-karat white gold and Forevermark diamond bracelet while performing “The Moon Song,” the Oscar-nominated single from the movie Her, which won for best original screenplay.

Lupita Nyong’o, who won the best supporting actress Oscar for 12 Years a Slave, accessorized with Fred Leighton’s 18-karat yellow gold and rose-cut diamond “Spiked Crescent” earrings and 18-karat yellow gold and diamond headband.

Figure skater Johnny Weir donned a diamond brooch by Le Vian. 

Philomena Lee, the real-life subject of the Oscar-nominated movie Philomena, wore Supreme Jewelry’s black rhodium and diamond drop earrings.