The stone is a Mercury Mist Topaz.  

The color of an icy waterfall reflecting a rainbow!  Well cut, throwing intensely cold fire, Mercury Mist is an enhanced natural silver topaz.  The process used in titanium treating natural Topaz is lending itself to a whole new world of cool stones, and this is one of the finest.

There are two center stones weighing a carat each with three accent stones placed in just the right places.  If you prefer to upgrade those accents to diamonds you can do that also.

When you get it,  if it's not everything you expected, you've got a whole week to ponder it before you have to mail it back for a refund.