Jenna Evans was on a high-speed train when she had a dream in which some “bad guys” were getting on and the best way to protect the 2.4 carat diamond ring was to gulp it down.
“I popped that sucker off, put it in my mouth and swallowed it with a glass of water,” Ms Evans said in a Facebook post.
Ms Evans, of San Diego, California, woke up and was relieved to realise it had been a bizarre dream – until she realised she was no longer wearing the ring.
She said: “When I woke up in the morning, there was no ring on my finger.
An upper endoscopy was carried out, in which a small camera and device is inserted down the throat.
Ms Evans said she began to cry as she signed the forms for carrying out the procedure because she feared she might die and not live to marry her fiance Bobby Howell.
In her Facebook post, she wrote: “I waited a long time for that damn engagement ring and I WILL marry Bobby Howell DAMNIT.”
Doctors located the ring in Ms Evans’ intestines and Mr Howell presented her with it again.
Ms Evans wrote: “Bobby finally gave my ring back this morning – I promised not to swallow it again, we’re still getting married and all is right in the world.
“I’m so grateful that everybody can laugh about it, because it truly is a very funny story.”
The couple plan to get married in May 2020.