Crystal skulls arrived on the archaeological scene in the 19th century. No one knew who made them. Eventually, they all turned out to be clever fakes.
In fact, it got a boost in 2008 with the release of the action-adventure sequel Indiana Jones and the Kingdom of the Crystal Skull.
I am prepared to risk it all by admitting that I enjoyed Indiana Jones and the Kingdom of the Crystal Skull. There it is. The 2008 film didn’t get the best reception because of its overdone CGI ...