Smurfportation crystal

A smurfportation crystal is a magical item that first appeared in Sony Pictures Animation's The Smurfs 2.

Mainstream Smurfs Media
Papa Smurf created from water inside the Forbidden Falls from the last blue moon for the purpose of time travel in The Smurfs 2, taking the Smurfs directly to Patrick and Grace Winslow's apartment and back to the Smurf Village by ingesting a crystal. In the movie, the crystals were intended for Papa Smurf, Hefty, Gutsy, Brainy, and Smurfette to use, but due to an accident, Clumsy, Grouchy, and Vanity were three of the four Smurfs that used it for their first trip. When Smurfette was rescued along with Vexy and Hackus, the Naughties who had been turned into Smurfs through the formula that Papa Smurf used to turn Smurfette into a real Smurf, she used her magic wand to create two additional crystals for Vexy and Hackus so that they can travel back to the Smurf Village.

Similar crystals also appear in The Smurfs 2: The Video Game during cutscenes that explain the game's story.

Hero: The Guardian Smurf stories
In the HERO: The Guardian Smurf story series, Papa Smurf creates smurfportation crystals in order to travel to the Good King's castle in order to get the aid of Sir Johan, Peewit, and Princess Savina in the rescue of Wonder Smurfette, who was captured by Gargamel so that she can reveal the secret formula Papa Smurf used to make Smurfette into a real Smurf.