How to make this particular blender material in Cycles I've seen this material which has been made using blender rendering's engine, and I'd like to give it a fresh look in Cycles.

Here is a screenshot of the nodes and the previewed material :


However, I tried using Layer Weights but the layers(white then blue) were not correctly applied to the subdivided Icosphere.

Plus in Cycles, I don't know how to use the alpha output since there is none on the material output node when using Cycle rendering engine.

I am a bit of newbie towards this, usually, I try things on the node editor, and they work out fine but this time, I really don't know what to do.

So if someone could explain to me, how to make this particular material using Cycle(even like if it's a bit more realistic), I'll be glad to take it as well as an explanation of the process during the making of it.

Thanks for any help!
If you want to do that in cycles the set up would look like this:

The layer weight node controls the falloff for blue and white respectively in combination with the color ramp to clamp the falloff. 

Of course the transparent node is to cutout the center, you might also want to play with the roughness on the glossy shaders, it will give you a different look .