The Amazing Spider-Man #350 (1991)
Writer: David Michelinie
Artist: Erik Larsen
Dr. Doom wants a piece of the Black Fox because he stole a gem that belonged to Dr. Doom’s mother. Spidey fights Dr. Doom and Black Fox escapes. Dr. Doom gives Spidey 24 hours to retrieve the gem and find Black Fox. The man Fox sold the gem to fenced it to Carpathian who wants to use it to summon the dark cloud of microscopic insects that Thor threw into space last year. Spidey and Fox crash the party. Doom shows up and retrieves his gem. He punishes Fox by destroying the enormously expensive jewel he just stole. Spidey then takes Fox to jail.