Thanks to metal mines which provided iron and copper to buyers all around the Mediterranean, the Etruscans were very wealthy. The murals from Etruscan tombs make it abundantly clear that they also liked to enjoy all the luxuries which wealth makes possible. This love of opulence combined with their mastery of art in an unrivaled tradition of goldsmithing. The Etruscans were master jewelers (and the unique beauty of their pieces regularly spawns modern Etruscan jewelry revivals).
Among the pieces frequently discovered are beautiful gold crowns and diadems in the shape of leaves, berries, acorns, waves, and geometric patterns. The Romans were well known for their love of crowns and golden wreaths–which marked various triumphs, victories, or successes. It seems likely that the Romans took this trait from the Etruscans (although the Etruscans may have copied these crowns from Greek or Middle Eastern antecedents). I found these photos of beautiful gold headdresses around the internet. Since the pieces are in such fine repair (and so numerous) I suspect they are from Etruscan tombs. Look at how subtle and elegant the goldsmithing is on some of these crowns. Etruscan craftsmen were famous for their mastery of various stamping, hammering, molding, and filigree techniques (which are very much in evidence here).
In the years after the Etruscan tribes developed into sophisticated states (but before they became crude republics) political power fell into the hands of various kings and tyrants. These strongmen may have marked their political ascendency with crowns and tiaras. It also seems likely that Etruscan nobles wore such adornments for sacred occasions…and to show off their wealth and status.