You asked if the beads will come out as blue as in the rough in the image you posted. More than likely the beads will not be as saturated as it looks in the rough. Usually the outer rind makes the color look a bit darker than when it is removed. The material you posted would with out a doubt make some very nice beads.

After my first post I thought about it and it dawned on me that there are many colors in chalcedony that we do not think of as being chalcedony. One that came to mind is Chrysoprase most don't think of Chrysoprase as chalcedony but it is, some of the finest green beads I have ever made were from Chrysoprase, many would think they were best quality Jade.

I have attached another image of chalcedony with color. One is purple and the other is a pink limb cast. Thomas "tasart" was kind enough to gift me the blue and also the purple I have posted and I must say they are some of the finest in these colors I have seen.

All my best ........ Danny