River stone

During Star Wars Jedi Apprentice: The Hidden Path by Jude Watson, Obi-Wan Kenobi's birthday passes. His Master, Qui-Gon Jinn slyly gives him a river stone as a present. At first, Oi-Wan just thinks his Master gave him a rock. Later on, when Obi-Wan is captured by the Syndicat and renewed for impersonation of a Syndicat guard, the river stone helps him hold on to his memories. That's when Obi-Wan realises the rock isn't just a rock, it's a Force sensitive rock. On the last page, Obi-Wan asks Qui-Gon if he did it on purpose, if he gave Obi-Wan a Force sensitive rock on purpose. Qui-Gon shrugs and says that he just thought it was a pretty rock and walks up the landing ramp of their ship with a smile.