The icon I've created has a few layers with a sphere gradient. This is how it looks with the Icon.

The has stared to gain some depth and detail, but its still not glossy. To add gloss to the icon, I create a series of layers called flares.
- So I'm going to create a new layer and name it "Top Flare".
- I'm going to create a circle with White stroke and fill.
- I'm going to align it exactly on top of the gradient layer.

Since the "Top Flare" layer is on the top and is not transparent you cant see the icon or the other layers below.
So lets add some transparency to this layer.
- Select the Top Flare layer
- Go to the Transparency window.
- Change the opacity to 50%

Now I'm going to reshape Top Flare circle. (You can use the pen tool and create the flare from scratch if your experienced with the pen too. That way you can avoid creating a circle and reshaping.)
- Select the pen tool and delete the bottom point on the circle.
- This should change the shape of your circle to something like this.

Now I need to align the flare so that it's relative to the light source. You can use the scale or rotate tool.
- Once you complete aligning, it should look something like this.

Now I'm going to create the final layer called the "Highlight Flare"
- So lets lock all the layers created.
- Create a new layer named "Highlight Flare"
- Use the "Pen" tool to create a flare shape.
- Change transparency to 50%.
This is how my shape is

- Now I'm going to expand the "Highlight Flare" layer on the Layers window and select the path I just created.
- Now I'm going to copy and paste on top of the same path. for this, select the path and hit "ctrl + C" and then "ctrl + F"

- Than on the new path, I'm going to change its property.
- Increase its transparency to 100%.
- Then fill a default white to gray gradient to it.

- Once your done with this, you need to select both the paths on the "Highlight Flare" layer.
- Go to the Transparency window
- Select the menu on the far right and select Make Opacity Mask.
and your done. The icon should look like this.

You can create multiple flares and add more detail to your icons to give it a true glass feel. But again this is a basic tutorial. Hope you had fun!
Download the illustrator file.














