In his first conversation with Galadriel (Morfydd Clark), Adar (Sam Hazeldine) brings out Morgoth's crown, a powerful symbol of the first Dark Lord, now coveted by the second one, Sauron (Charlie ...
Taking all of this into account, Morgoth's crown should not still be in Middle-earth at the time of The Rings of Power. That said, it does resemble the Iron Crown as it is described in lore.
Results that may be inaccessible to you are currently showing.