Rio 2016 medals rusting, chipping away

Not all of the Rio 2016 medals were built to last, apparently.

Nine months after the conclusion of the Games, medals awarded to more than 130 winners have been returned to organizers due to rusting and chipping.

"We're seeing problems with the covering on between six or seven percent of the medals and it seems to be to do with the difference in temperatures," Rio Games communications officer Mario Andrada told reporters Friday, adding that it's "completely normal," reports Marissa Payne of The Washington Post.

Olympic gold medals are comprised of just 1.34 percent gold, with sterling silver making up the rest. Approximately 30 percent of the sterling silver used in the Rio medals came from recycled silver.

American boxer Shakur Stevenson, who won silver at Rio, is among those experiencing problems with their medals.

"My Olympic medal is definitely breaking apart," Stevenson told Steve Politi of NJ.com. "It's peeling off."