This tutorial is for creating a blue glassy orb, which is rather simple to do, so there shouldn't be any problems in getting yours to appear almost exactly similar to mine. Besides, there are about a billion orb tutorials on the net, so what's one more? I am also going to assume that you are not new to Photoshop, so I won't go into great detail in this tutorial.
Okay, let's begin.
Step 1Start a new image (Ctrl+N) with these settings:
Width: 400
Highth: 400
Resolution: 72ppi
Color Mode: RGB, 8 Bit
Step 2Select the Eliptical Marquee Tool and create a 300x300 circle.
Step 3Set your background color to #01516B & foreground color to #FFFFFF. Now, with your Gradient Tool set to Radial, drag from the inside-top of the selection to just outside the bottom. Then repeat, but start a little further down the second time.
Step 4With your circle still selected, create a new layer (Ctrl+Shift+N) on top of your circle. Set this new layer to Color Dodge. Now, with your Gradient Tool again, and using just the blue (#01516B), drag from the inside-bottom of the circle to the middle.
Step 5Create another layer on top and set it to Linear Dodge at 55% Opacity. Once again, drag from the inside-bottom to half the distance of the previous layer.
Step 6Create a new layer on top and fill it (the color isn't important). Now set the Fill Opacity to 0%. Open the Layer Effects Menu and add the following settings.

Your orb should now look similar to the following image.
Step 7Create a new layer on top and fill it (the color isn't important). Now set the Fill Opacity to 0%. Open the Layer Effects Menu and add the following settings.


Again, your orb should appear similar to the following image.
Step 8Deselect the circle (Ctrl+D). Create a new layer on top. Set the Opacity to 50%. Now, with your Eliptical Marquee Tool, drag an oval shape like the image below.
Step 9Now with your Gradient Tool, drag from the inside-top to little more than half way down the oval. Deselect and add a Gaussian Blur (Filter>Blur>Gaussian Blur...) with a Radius of 2 pixels.
Step 10Open the Layer Effects Menu on the original orb layer and add a Drop Shadow.

Simple as that. Orbs can be very versatile & have many, many uses in Photoshop when creating images. An example of just one thing that can be done with this orb is pictured below.

The PSD from this tutorial is also available in the 13Dots download area.