UFO Pasadena California January 12 2009 Video

This may not be the actual shape [diamond] of the object..

Diamond shapes on video cameras are usually due to "max" zooming on a bright light... and the result will be the camera aperture shape is caught on the video (which is a diamond shape).

Read Marvins excellent analysis of similar "diamond-shaped" UFO's over on Open Minds Forum

..and watch the test videos