Belles asked for this tute after reading my other tute on triangles.
The diamond shape is snowballed but not with a square -- trhe snowball looks more like a kite. You can change the width or length of the diamond you want with adjustments to the "kite" you use.
This tute is in PDF format; you will need Adobe which can be downloaded free here:
http://www.adobe.com/products/reader.html
Enjoy! :-)
Jan in VA