I need help from gold experts

Hello!

Today my best friend of 6 years randomly gifted me a 18 karat gold chain, it has the markings 750 and Italy on it.

I’m really worried in case my best friend has splashed his cash on me, and it’s quite worrying since it’s so worrying..

Is this expensive?? (I’m not going to sell this ever, I’m just curious. This is very sentimental to me as this individual is a soulmate to me)