Concepts for the crowns of the High Kings of the Noldor:
Finwë- gold, silver, jewels, chains, an ever evolving everything and the kitchen sink approach
Fëanor - given the rather abrupt death of his father and absolute shitshow volatility of his time as king, he has a more practical low lying mesh wrap with plenty of loops, beads, ext and starts a tradition for kings of the Fëanorian line to leave 3 empty spaces for the silmarils.
Maedhros- his classic copper circlet with silmaril spaces and simple chain drapery
Maglor gets one for his time as regent because I said so. A basic silver circlet with silmaril spaces and chain fringe
Fingolfin’s crown is the first time since Finwë that they have had time and resources to devote to a showy centrepiece- inspired by a Chinese opera headdress from the Qing Dynasty, this crown marks a return to tradition and unity with a sleeker design more appropriate for the warlike times of the First Age.
Fingon wears a golden Dragon guan- think Lan Xichen in the Untamed but make it gold and make it More
Turgon’s crown mimics the shape of his father’s but far sleeker and simpler, with bands to represent each gate of the Hidden City
Gil-Galad’s crown features a heavy Sindarin and Silvan influence with the leaves and branch like circlet, with the option to attach strands and chains that drape and weave through the hair for a more traditional Noldor look, though he rarely bothers