
Apply gradient overlay as shown :-

Colors used :- #FFFFFF (white), #1A8DB9 and #B2D6E6 .

Add #384E77 color outside stroke in it :-

Now, draw a black color circle as shown :-

Add radial gradient overlay as shown :-

Color used :- #FFFFFF #4FC2E1 #374D75
Here what you get after adding gradient overlay :-

Now, reduce its opacity to 60%. Copy (press alt and drag the layer) and place the layer as shown :-

Now, draw this shape with ellipse tool :-

Reduce the fill to 40%

Duplicate, increase its size and place two more layers of it as shown :-

Finally, if you like you can add shadow as shown :-

Feel free to post your experience/comments/suggestions.