Where does “preciosísimo” come from?

preciosísimo (Spanish) comes from Spanish precioso, from Latin pretiōsus, from Latin pretium, from Proto-Italic pretjom, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “preciosísimo”, step by step

Step	Language	Word	Meaning
1	Spanish	precioso	gorgeous; cute; precious
2	Latin	pretiōsus	valuable, precious
3	Latin	pretium	worth, price, value, cost; pay, hire, wage,...
4	Proto-Italic	pretjom	—
5	Proto-Indo-European	per-	before, in front; first; to go through
6	Proto-Indo-European	pr̥tós	passed , crossed

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Italic pretjom →