Force-reactive stone
A unique kind of rock showed a response to the Force. This rock was incorporated into the necklace referred to as the Jedi Tears, a Force artifact.
Behind the scenes
This rock appeared in the young-adult book The High Republic: Path of Deceit, released in 2022 and authored by Justina Ireland and Tessa Gratton. It was part of Phase II of the Star Wars: The High Republic project which included many forms of media.