Auto Insurance Claims: Accident damage, auto body shop, chevy colorado

Question
I was rear ended at a red light. The auto body shop found a "frame diamond"
resulting from the collision. My vehicle was a 2004 Chevy Colorado, the
vehicle that struck mine was a 2000 Grand Prix.
Would you please tell me what a "frame diamond" is, and what rate of speed
would cause this? The vehicle appeared to have very little damage unless you
had a direct view from behind, or compared the gaps in the vehicle.  (The
accident was over 2 years ago and I no longer own the vehicle) A recent
conversation sparked this inquiry, in hopes of an accurate answer.
Is there a website to research in the event that I can't find an answer here?
Thank you.

Answer
Hi Dee,

There is no way to determine what speed of impact is needed to create a "diamond". A diamond is simply a description of a type of bend in the frame. Each vehicle is designed differently. Different rates of speed will cause damage to a vehicles frame differently on each vehicle. In addition, it may also be the direction of impact and the speed at which both vehicle are traveling. As I said, it is simply a description of the appearance of a bend in a vehicles frame.

I hope this helps
Richard Hixenbaugh