Tiffany bracelet I just bought for $10 at an unboxing store

So, this isn’t as interesting as most of the posts in this sub, but perhaps you can still help me. The engraving on the bracelet reads “Tiffany&Co.Au750 ITALY d2.18ct.” There are 41 gems, which I’m hoping are real diamonds. Is that possible? How can I know? The store I bought it from frequently has high ticket items that are mixed in with junk in large bins. Today someone found a MacBook Pro, so I do believe it’s possible that it’s an expensive bracelet, though I won’t be surprised if you tell me it’s on the lower end price wise. I just want to know exactly what it is so I can give it to my girlfriend! TIA for the help!

P.S. Ignore my hands, I work construction.