Deputies responded to a West Hollywood hotel late on Wednesday after the custom Calvin Klein Collection by Francisco Costa dress was reported missing from the actress's hotel room, sheriff's Sgt. Richard Bowman said.
Bowman said Nyong'o was present when deputies took a report about the theft.
Detectives were at the hotel on Thursday looking for clues, including whether surveillance footage would reveal what happened to the elaborate gown.
The custom ivory dress included 6000 pearls of various sizes. Nyong'o won an Oscar in 2014 for her role in Twelve Years a Slave and was a presenter at Sunday's ceremony.
Her publicists said on Thursday they would not comment on the theft.
Nyong'o, 31, has become a darling of Hollywood's red carpets in the past two years, with commenters and fans praising her fashion choices.
The Kenyan actress accessorized the dress with Chopard diamond drop earrings and three Chopard diamond rings. Before the awards ceremony, she told The Associated Press on the red carpet, "I'm just wearing my diamonds and pearls. My homage to Prince," referring a popular song by the musician.
Oscars Prep Timelapse. #ItTakesAVillage. #GlamSquad #Oscars @theacademy @calvinklein @costafransisco @chopard. @dilokritbarose @larryjarahsims @houseoferlanger @deborahlippmannA video posted by Lupita Nyong'o (@lupitanyongo) on Feb 25, 2015 at 9:08pm PST
Oscars Prep Timelapse. #ItTakesAVillage. #GlamSquad #Oscars @theacademy @calvinklein @costafransisco @chopard. @dilokritbarose @larryjarahsims @houseoferlanger @deborahlippmann
A video posted by Lupita Nyong'o (@lupitanyongo) on Feb 25, 2015 at 9:08pm PST
Nyong'o told a reporter for Yahoo Style that she was involved in the design process of the dress.
"We talked about it being fluid and liquid," she told the site. "I wanted it to be an homage to the sea."
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