Can anyone suggest some site where I can get some idea on diamond ring designs?

You can visit www.like.com to get some ideas. They have some nice diamond rings. Since I'm not quite sure what you're looking, it's hard to come up with a specific place.

I bought a lovely stud earrings from twin-diamonds dot com
Try checking that site out. It got real cool collection and designs

You try to visit www.debeers.com...They had elegant designs of diamond rings. Or you try to visit this site, too. www.novori.com...I hope these could help.

I will second Farce's Shaneco. That's a company that I've heard many good things about. Best of luck to you

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-Brittany Brydahl