The color of this block LRI is a pretty cornflower blue. The bonus is the olive green streaking in two parts of the glass. This style of block is not scarce, so be cautious when purchasing one that is a shade of aqua. Most of these that I've seen in the past 30 years are a shade of aqua, leaning to blue-aqua. Pretty, but common. This cornflower one was purchased out of an auction catalog some years ago.