SAN JOSE – A Costa Mesa bride-to-be hopes a good Samaritan will help reunite her with her engagement ring, which she last saw Friday at Mineta San Jose International Airport.

Libby Dahl removed her ring and set it on a ledge near a bathroom sink before she washed her hands at the San Jose airport, she said. Dahl took off the ring because it was too big, but mistakenly left it there when her Uber driver called her and she rushed outside for the ride.

“A split second mistake turned into a nightmare,” Dahl said.

She last saw her ring around 9:15 p.m. Friday in the women’s bathroom in the Terminal B baggage claim area. Dahl flew into San Jose on Friday night for a wedding.

Dahl realized the ring was missing about 20 minutes after she left the airport. She returned to the airport and checked with custodial staff and Transportation Security Administration agents, but the ring was never turned in.

“It’s stupid that I even took it off, but makes me so sad someone would take it and not turn it in, especially a woman in the women’s bathroom,” she said. “I just want it back and would pay a monetary reward to get it back. Its sentimental value is irreplaceable.”

San Jose airport spokeswoman Vicky Day confirmed that the ring was reported missing.

Dahl described the ring as “white gold with a round center diamond in a square halo setting.” Her fiance, Jeremy Jorgenson, had the unique ring custom made for Dahl before he proposed to her on Christmas Day last year.

Jorgenson was “pretty devastated, too,” when he learned of the missing ring.

“I was just hoping that somebody would have a change of heart by now and turn it in,” Dahl said Tuesday.

Dahl and Jorgenson were introduced to each other by friends while attending USC. They dated for more than five years before Jorgenson proposed to Dahl in private at his parents’ home in Minnesota.

Dahl said the custom-made engagement ring was exactly what she would have picked, as it resembled rings she displayed on her Pinterest board. The couple hasn’t set a date for their wedding, but plan to marry during fall 2017.

Although the ring is insured, a replacement will never hold as much sentimental value as the original.

“It would mean so much to me if I could have it back,” Dahl said. “I could never replace it.”

Dahl encourages anyone with information on the missing ring to call San Jose police at 408-277-5400.