Hi Mike,
Glad you found a setting that you like. My guess is that this ring is a tension setting with curved white gold bands holding the sapphire in place.
Here's a little bit more info on tension settings: A tension setting means that the gemstone is held in place by pressure rather than prongs, a bezel or other mounting. The metal setting is actually spring-loaded to exert pressure onto the gemstone, and tiny etchings/grooves are added to the metal in order to create a shelf for the gemstone's edges to rest. The gemstone appears to be suspended in the air with nothing holding it in place.
