I loved the look of this cable and diamond pattern when I first saw it. I reworked it a bit so that it would grow naturally from the twisted cable ribbing. It's an easy pattern to work, and it doesn't require a cable needle. Knit it in a soft yarn for a lot of drape, or a stiffer yarn for more body.
In Twisted Cable Rib, 28 sts and 28 rows = 4"/10 cm; in Twisted Cable and Diamond pattern, 27 sts and 27 rows = 4"/10 cm.