Engagement rings?!

Does the price of a ring really matter? 
What are people's oppinions. I've been really bad and I've found out my partner has bought a ring yet I'm doubting myself as when I saw the price I feel as if there might not have been any thought into it and that I'm not worth anything? Is this normal? I love him to bits so to me price means nothing compared to how I feel about him. Just I thought there would of been more than 99p obviously I don't want a thousand of pounds ring as I know we can't afford something like that yet I thought maybe it would of been around the £30 mark... Help!