Lets hope grandpa has better taste than daddy, that tiara looks bad and Leti knows it when you only wears a Love-gift from your husband once😏 I guess it might end with Sofia, and Leonor will get a more historic piece, Princess Irene possible has several and the the family of Felipes aunt also. But my guess is Leonor will debut with Letizias wedding tiara. Its a perfect starter and good for Sofia seniors rather oversized ego.
It's possible Leo might wear the Prussian Diamond tiara first. The press often said Leo looked like her great-great grandma Victoria Luise. https://royalwatcherblog....3/prussian-diamond-tiara/
Leti's wedding earrings were a gift from JC. There were made of several 2-carat and 1-carat diamond studs, so probably more expensive than a princess tiara with tiny diamonds. I don't see JC has an issue buying Leo a historic tiara, it's really up to Felipe to decide if it's a bad idea or not