The Harrisburg, PA. Goodwill distribution center found a surprise while sorting through recent jewelry donations. A platinum and diamond ring appraised at $17,600.

Barry Landis, a retired jeweler who helps at Goodwill by sorting through donated jewelry, said that what caught his eye was the filigree swirls on the band. While 90% of the jewelry donated to Goodwill is costume jewelry, this 2.6 carat diamond ring may be the single most expensive donation given to the Harrisburg Goodwill.

But no one knows why the ring was donated. Was it a generous gift? An accident? Or maybe a relic from an ended marriage?

No one knows, but “We can have fun thinking up stories behind it” said Jennifer Ross a Goodwill spokesman.