Here is a direct comparison between a standard aqua 162.3 and a suspected sapphire blue 162.3. These are not listed in the price guide, but holding them side by side you can see the difference pretty easily. This photo is not the best, but we haven't had a sunny day here in western PA for quite awhile (not that I'm complaining... love the snow!).

Aqua on left, sapphire on right.