Mischelle Guerrero met her high school sweetheart when she was 15.
"This was our very first engagement ring, I remember he had to do the monthly payments because we were so young," Guerrero said.
This was the very ring he gave her 18 years ago, the same ring she had always planned to give to her oldest daughter when she turned 15.
"I had this vision of giving it to her on her birthday and then her getting married," she said.
That birthday finally rolled around on Friday, but an hour later, it was gone.
"She says where's the ring?" she said.
Turns out, her daughter took the ring off and put it on her lap while she was putting on lotion on their way to Starbucks.
"She just got out and went right in and that's where she dropped it," she said.
Her husband went back to Starbucks where they say a young Good Samaritan found it in the parking lot and turned it in.
"I could see something in his hand and he said I have good news and I have bad news, and he said, the good news is I found it, the bad news is it was run over and it's missing the diamond," she said.
So she took to social media, on a Citrus Heights community Facebook page to share her story and thanking the unknown Good Samaritan for turning in the ring.
"Ladies always notice diamonds," Brenda Hamblin, a Starbucks barista said.
Hours later, one of the baristas chimed in on the Facebook post.
"I was like, oh my gosh, I have to comment on this post," Hamblin said.
Hamblin was busy helping with the drive-through when she noticed some extra sparkle on the counter.
"Whenever they picked up the ring to give to the husband, the diamond must have just fell out," she said.
Breathing a sigh of relief, Guerrero went to pick it up.
"It really means so much to me that I have it back," Guerrero said. "It really restored my spirit."
Hamblin could have put it in her pocket or even swept it onto the floor. Instead, she came forward.
"When it's somebody's livelihood, this is a ring, I would turn in even the cheapest ring to somebody, it could be a paper band, but this was something special to somebody," Hamblin said.
At the end of the day, she hopes this will encourage more people to do the right thing.
"See something, say something, whether it's good or bad, there's a lot of good things that happen in this world," she said.
Guerrero hopes to get the ring repaired and plans to keep it for a while longer because of the story. She says she may look into getting something similar looking as a replacement for her daughter.