The Mind Stone's current holder is Vision, who has the gem embedded in his forehead.

However, the Mind Stone has had several previous owners:

* Loki: He stole the Mind Stone from the Tesseract during the events of "The Avengers."

* Thanos: He acquired it from Loki, but it was eventually removed by Vision.

* Vision: He was created by Ultron, who used the Mind Stone to bring him to life.

Ultimately, the Mind Stone was destroyed by Thanos in "Infinity War," but its power remains woven into the fabric of the universe.