Just four hours after popping the question, the ring slipped off Daniella's finger and fell down a grate in Times Square.
"I was devastated", Anthony told The New York Times.
The next day, the NYPD announced that, with the help of social sleuths assisting in the multinational probe, it had found the victims of the matrimonial miscue - who it identified as John and Daniella - at home in the United Kingdom.
They were on the way back to the hotel, however, when disaster struck.
"I can still visualize the ring", recalls Drennan.
Drennan and Anthony said they would give the officers a mention at their wedding, and they'll be returning to NY to lift a pint with the detectives.
This English couple is rejoicing in the return of the engagement ring that they had presumed to be lost forever after it disappeared down a New York City grate last week.
Police opened the grate and climbed down to search.
Police are seeking a couple who lost an engagement ring down a grate in NY moments after the man popped the question.
"Thank you, Twitter. Case closed!" the NYPD posted Sunday afternoon, along with a photo of the happy couple. "Help us find them?" the NYPD said on Twitter.
Both John and Daniella took to Twitter to express their delight and thank the NYPD officers involved. "In the end, we had no choice but to walk away and try to enjoy the rest of our weekend". She added, "We don't use Twitter-we had absolutely no idea this was going on". "So happy it's been found we can't believe it".
They also wanted to send a heartfelt thank you to everyone who stopped to help look at the scene.
Through photographs, it was clear Mr Drennan was the correct man. Police have since arranged for the ring to be shipped back to the couple, police sources advised.
A child gave Ms Anthony a hug as she sobbed.