Is a diamond real if there is a diamond symbol on the ring?

The only real way to tell if a diamond is real is to let someone look at it that knows what they are looking at. They can tell you if it is a genuine diamond and tell you what quality it is. There are tons of imitations. There are diamond testers that pretty well for about $100.00 also.

If the ring is inexpensive and the diamond looks clear not yellow with no visible imperfections, clouds, or black dots; then that sounds too good to be true.

I'll attach a little more info about diamond quality as a resource.