Rich Red/Blue Fire on a Black background -- strictly goosebump material.  These created Black Opals look just like the real thing, but at a fraction of the cost.
Totally gorgeous, and fraction of what real ones would cost -- but you pretty much have to be a jeweler to tell the difference.

This is good, solid, everyday ring -- the mounting has a strong structure and is well built.    

The nicest thing about this particular mounting is it's low domed effect.  It's a ring you can wear all the time -- stick your hands in your jeans pockets and not get hungup, etc.  Just plain comfortable.