Final effect Diagram
The first step is, of course, to know what the diamond is like? Look for such a picture. It's all over the Internet. Oh.. Then draw the shape of the diamond. If you want to get a precise picture of the diamond. Then you're going to be on the path of honesty. If you just want to draw a diamond to make yourself happy, then you can also use my drawing of the line, (of course, how to take down the line, not within the scope of this post, such a tutorial is more, no more to say) OK, let's get started.
The second step, the pattern fills, (other patterns I have not tried, anyway PS in the deposit of the one I feel very good.) , and then perform polar coordinates, of course, choose the polar to the plane (alas you say, hum), and then the implementation of the good polar coordinates pattern. Buckle down. Well. Look at this. The diamond is a little embryonic. Yo, come on.