Sharon Osbourne‘s very grateful a fan returned her massive diamond ring … and, it clearly pays to be honest — ’cause she’s offering that fan a once-in-a-lifetime experience.

Here’s the deal … Osbourne revealed to her Instagram followers she lost her wedding ring at a Birmingham event for soccer team Aston Villa’s new store — but, luckily, a Good Samaritan found it and chased her down in the parking lot to return it.

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At the time, Sharon explains, she was so shocked, she didn’t get the fan’s name … and asked fans for help identifying her guardian angel ’cause losing her wedding ring — her second, after the original was stolen — would’ve been really unfortunate.

Welp, internet sleuths remain undefeated … ’cause they identified her as Sharon Bardsley — a local business owner and mother who was at the opening with her 15-year-old son.

Now, Sharon’s repaying Bardsley’s random act of kindness … telling TMZ she’s offering Bardsley and her family a VIP experience at a show her husband Ozzy Osbourne‘s participating in next year.

He’s preparing to perform in Aston — an area of Birmingham where he grew up — sometime next year with a number of friends, we’re told … and, Bardsley and her loved ones will get to watch the whole show from the wings.

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Osbourne’s already reached out to Bardsley … the two having a lovely conversation on the phone yesterday.

Moral of the story … keep an eye on the ground — ya never know which celeb’s jewelry might be lying there!