If you are a beginner or someone whom just hasn't tried making magic circles or rings yet (both apply to me), please check this tutorial video by my friend Lorene over at Cre8tion Crochet.
It's short and sweet. She does a great job in demonstrating this technique!
But be sure to pay close attention. She speeds up during the second through twelfth double stitch.
So be prepared to restart the video a couple times.
To see a step-by-step pictorial of this and many more tutorials, head on over to her blog www.Cre8tionCrochet.com.