So I was given this ring only I dont know where he got mine from.

http://site.netaya.com/itemimages/4wf354pj50-00.jpg

Its white gold and .50 carat diamond
I dont know anything about rings but I know its shallow but i would like to know if this was an impressive ring I am 20 if that makes a difference. I was kind of wondering how much a ring like this is worth.
Its an engagement ring in case that changes if its impressive.
Well thanks for most of these replys really looking forward to getting married later on this month the reason I ask was because I felt kind of guilty about him buying me a ring because we just paid off our house and I know money was tight.