Adrian from Vector Pack sends in this tutorial using Adobe Illustrator. This one utilizes many of Illustrator's key functions, and provides some rich exercises for practicing the Illustrator vector craft. . .
Adrian writes :
STEP 1 - Create a new document. It can be any size you want. Let's set it at the standard 800x600 pixels, resolution 72 (for screen, if your design is meant for printing, then set the resolution at the maximum 300 dpi) and use the RGB color mode.
STEP 2 - Time to start drawing the first ring. With the Ellipse Tool (shortcut L) create an oval, then duplicate it and, by using the Direct Selection Tool, modify the outer circle to look like the one in the picture.
Select the outer circle and copy it, paste it in front and lock it by using Ctrl + 2 (we will need this second circle later). Select these 2 circles and go to Object, Compound Path and click Make. This will combine our two shapes and create a new one.
STEP 3 - Next step is to create the inside part of the ring. By using the Ellipse Tool create a oval, then duplicate and move it so it looks like in the image below. Then open the Pathfinder pallete and use Exclude overlapping Shape Areas, then click Expand.
In the image you see that there are two sepate parts of the circle. Use the Direct Selection Tool to select a point from the right part, then hit Delete 2 times.
Now duplicate the shape of the ring, paste it in front and select both this shape and the half circle, and click once more the Exclude Overlapping shape areas, then delete the part that you no longer need.
Next, we'll be adding some details
... continues on the next page!