It was Hollywood's most important night of the year, and glamorous stars from Natalie Portman and Cameron Diaz to Angelina Jolie and Jennifer Lopez looked dazzling in platinum and precious stones as they made their way down the red carpet to attend this year's Academy Awards, which bestowed the Best Picture Oscar to "The Artist." Other big winners last night were Meryl Streep, who won the Best Actress Oscar for her role as "The Iron Lady," and Best Actor Jean Dujardin for his role in "The Artist." Winning Best Supporting Actor was 82-year-old Christopher Plummer in "Beginners," and taking the Best Supporting Actress Oscar was Octavia Spencer in "The Help." According to Platinum Guild International, the following is a list of stars who celebrated last night's achievements wearing platinum jewelry:

Best Supporting Actress Octavia Spencer. Platinum-and-diamond briolette chandelier earrings (20 carats). Platinum and diamond cocktail ring. All by Neil Lane.

Jennifer Lopez. Platinum-and-diamond drop earrings. Platinum and diamond rings. All by Lorraine Schwartz.

Angelina Jolie. Platinum and cushion-cut diamond drop earrings (20 carats). Platinum and cushion-cut diamond ring (15 carats). Pair of platinum and diamond pins worn on the back of her waist (25 carats). All by Neil Lane.

Cameron Diaz. Platinum and emerald-cut diamond necklace. Platinum and bezel-set diamond stud earrings. Platinum and round diamond dome ring. All by Tiffany & Co.

Penelope Cruz. Platinum and pear-shape diamond necklace (56 carats). Platinum and diamond cluster earrings (15 carats). Fancy-shape diamond line bracelet (43 carats). All by Chopard.

Natalie Portman. Platinum and diamond V-shaped cluster necklace. Platinum and oval diamond drop earrings (5.76 carats each). Both by Harry Winston.

Tina Fey. Platinum earrings with 16 oval-cut blue sapphires (47.36 carats) and 16 mixed-shape emeralds (2.94 carats). Platinum ring with sapphires (15.10 carats), emeralds (3.60 carats) and baguette diamonds (0.66 carats). All by Bulgari.

Kristen Wiig. Three platinum and diamond bracelets. Platinum ring with diamonds, emerald and ruby. Both by Neil Lane.

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