It's such a BEAUTIFUL eternity band! But, I agree with @RMOO . If you are already questioning it, you should probably go larger.
For reference, I have a 1.3ctw carre cut eternity band that I wear with my wedding set on a size 6 finger (see avatar pic.) It's PERFECTION in the stack, but I don't think I could wear it alone as a right hand ring...
I like your carre cut! I think the one carat would be fine as a stacker…looks a bit small alone. I need to decide if I want a full eternity or just something that’s a bigger look on top.