How much power does this queen want tk project as a character? I would think that an ambitious queen would want as tall and bulky of a headpiece as was feasible so that eyes would be naturally drawn to her even inside a royal court filled with sparkling tiaras. If this is the Alice I remember, her crown can be silver and made of silver strands with clusters of rubies that look like rose vines, tastefully reserved but pretty. If she is a queen of queens and wants all to be awed by her (like maybe Darius in 300), her crown can be tall as a pope hat, gold, showcasing the largest jewels in the realm, and polished daily.