Italian word prezioso comes from Proto-Indo-European *preti-, and later Latin pretiosus (Valuable, precious, expensive, costly.)

Detailed word origin of prezioso

Dictionary entry	Language	Definition
*preti-	Proto-Indo-European (ine-pro)
pretium	Latin (lat)	Bribe. Pay, hire, wage, reward. Punishment. Ransom. Worth, price, value, cost.
pretiosus	Latin (lat)	Valuable, precious, expensive, costly.
prezioso	Italian (ita)	Precious (also figurately), valuable (also fig.), costly, invaluable Jewel, valuable.

Words with the same origin as prezioso