Sarah Darling, who lives in Kansas City, told CNN Friday that she had put the ring in her coin purse because it was giving her a rash. When she saw Billy Ray Harris, she gave him her change and forgot the ring was also in the purse.
Two days later, she found Harris, who said he had been keeping the ring for her.
"I actually feel like I'm especially lucky to have this ring now. I loved it before. I loved it so much, but I love it so much more now. I feel like it has such great karma," Sarah Darling said on "Starting Point with Soledad O'Brien."
Darling and her husband, Bill Krejci, set up a fund for Harris on the giveforward.com website. More than 3,400 people from around the world have made contributions.
Harris will get the money after 90 days.
Ophelia Wong Zen-man gave $10: "I am from Singapore and I greatly am grateful for your honesty!"
KCTV, the CNN affiliate in Kansas City, talked to Harris on Saturday.
"I like it, but I don't think I deserve it," he said. "What I actually feel like is, 'what has the world come to when a person who returns something that doesn't belong to him and all this happens?'"