How to make 3d button in adobe illustrator. » Deep Tuts

Make a Circle and fill gradient.

Make 2 circles, move slightly upper circle  and minus front.

Use "pathfinder" tool

Make it little transparent & make more shapes.

Create this shape again and cut out middle part.

Make a bordered circle & expend,  use minus front.

Use lines & do same process to make shape.

Results,  something like this

Cloud Banner

Now we create flash light effect

Make circle with transparent outside and transform, use multiple shapes.

Cloud Banner

Make it like this.

Reduce size and  place it.

Another shape.

Make a circle & use gaussian blur.

Make shadow

It's Ready