Shine bright like a diamond.

Rihanna delivered some major bling at Saturday’s Formula 1 Las Vegas Grand Prix, wearing a six-figure custom Jacob & Co. watch around her ankle as she rocked an edgy black look at the star-studded race.

The “Diamonds” singer, 35, showed off the $400,000 18-karat white gold piece over a pair of black Balenciaga pantaleggings ($4,550), with the dark fabric showcasing the incredible accessory.

The strap on her Jacob & Co. creation features three strands of diamonds, with the watch including 70 carats of round and emerald cut stones in total.

Rihanna’s jaw-dropping anklet wasn’t the only diamond statement piece she wore; she kept the sparkle going with several pieces from Messika, including a three-strand choker, statement ring and glittering ear clip.

The Grammy winner — who wore her newly blond hair in soft waves and sported red lipstick — kept the black theme going with the rest of her outfit, choosing a leather Balenciaga jacket along with a hoodie from the brand, which she wore unzipped to show off a peek of bra.

While her accessories were anything but understated, we’re told she kept a low profile at the event, with a spy telling Page Six Style that Rihanna didn’t appear on the starting grid with other celebrities.

She also wore a pair of dark shades from Ambush at the event and kept them on throughout most of the race while watching the action with other VIPs in the Ferrari garage.

The “Umbrella” singer was joined by plenty of other famous faces at the event, including Heidi Klum, Paris Hilton, Patrick Dempsey, John Legend, Rod Stewart, Kylie Minogue and Gordon Ramsay.

Of course, her partner A$AP Rocky, 35, also joined in the fun, with the rapper also launching his Puma x F1 collection on Friday night.

Her F1 moment isn’t the only time in recent memory she’s showed off some major bling on her foot; Rihanna turned a $600,000 pear-shaped diamond ring into a foot accessory while hitting the town in May.

Keep on shining, RiRi.