The 25-year-old former The Girls Next Door star and Playboy Playmate attempted to return her $90,000 three-carat diamond ring to Hefner on Sunday, but the Playboy founder and editor-in-chief refused to take it back, RadarOnline reported.
"It was the right thing to do," Harris told RadarOnline about her overture.
Harris reportedly stopped by the Playboy Mansion to give Charlie, a dog, and the diamond sparkler back to Hefner. However, in addition to telling Harris to keep the ring, the 85-year-old also reportedly told his ex-fiancee to hold onto a Bentley car he had previously given her.
Hefner is apparently relieved with how his previous relationship's series of events have transpired.
"After all is said and done, staying single is probably the best. I think I just missed a bullet," Hefner wrote on his Twitter account, according to RadarOnline.
Although Harris has termed her split with Hefner a mutual decision, she has also admitted she was the one who made the decision to call off the wedding days before she was set to walk down the aisle.
"I called it off because I didn't think it was the right thing for me to do," Harris told Ryan Seacrest during an appearance on his On-Air with Ryan Seacrest syndicated radio show last week.
"Hef's lifestyle isn't the most normal lifestyle and that was another thing where I was kind of like, 'This isn't the lifestyle for me' -- multiple girls around all the time and the Playboy lifestyle -- I don't know. I just wanted to be true to myself and he's fine. He has really close people around him all the time."
Harris also suggested Hefner -- who she had been dating for nearly two-and-a-half years and got engaged to over the holidays last December -- only wanted to get married to make her happy, and that her choice to split from him was not impulsive.
"For awhile... I've been having second thoughts about everything. I haven't really been at peace with myself lately, so I just didn't think it was fair to him," Harris told Seacrest. "It all happened so fast, and they were going to air a [reality show special on Lifetime] on it. It was all happening too fast for me, and I just sat back and thought about it all and if this was what I wanted. It wasn't."