I have attached a copy of the ideal scope from a ring I am looking at. I dont have very much experience looking at these and I was hopeful someone would be willing to give their opinion of this picture. It would also be great to know what to look for in a quality ideal scope.
Apart from not being perfectly lined up, that is a very fine stone.
You can read about ideal scope under Tools in the upper left tool bar - and at www.ideal-scope.com - look at the reference chart.