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Oscar-nominated actor Charlize Theron walked tonight’s red carpet in head-to-toe black, but she still stole everyone’s attention. It probably had something to do with the gigantic rock on her neck.

charlize theron oscars diamond necklace
Amy Sussman/Getty Images

The Bombshell nominee wore a massive marquise-cut diamond necklace from Tiffany & Co. that measured a whopping 20 carats while walking the red carpet with her mom.

Her stylist, Leslie Fremar, posted a sneak peek of the necklace on Instagram with the caption, “How can something be so beautiful? A night like tonight calls for one-of-a-kind natural diamonds—it’s no wonder these precious gems have been synonymous with Hollywood for decades. Charlize’s necklace for tonight!”

The rest of her look—a one-shouldered design by Dior Haute Couture—was Old Hollywood glam to a tee, but we almost didn’t notice. We were too busy staring at that bling.

RELATED: Kaitlyn Dever’s Oscars Gown Was 100 Percent Sustainable and 100 Percent Glam

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