The Smurfs S01 E34 The Curse of the Smurfs' Treasure

"A new touch of blue."

Farmer and Vanity find a chest with a magical jewel that brings bad luck to everyone who touches it. Unfortunately, Farmer, Brainy, Jokey and Hefty touch it, so they want to bury it to reverse the spell, but Vanity takes the jewel obsessed with it.