Hi Jan,
Here is the link to the infrared heating pad I just bought. Apparently the jade is heated and then emits infrared heat.
http://www.amazon.com/Therasage-Infrared-Heated-Healing-Small/dp/B0039OPBIA/ref=sr_1_1?ie=UTF8&s=hpc&qid=1276830503&sr=8-1
As you can see, it is pricey, but I can tell you it seems like a very high quality product. I just used it today and I felt a deep heat rather than a surface heat and my hip did seem to respond to the treatment.
I'm not sure what you are wanting the pad for as to whether this would fit the bill or not. They also have a full body one that you can lay on just like this for $279 (I think) where you would get the benefits of the infrared from head to toe.
Hope this give you a little more info than you had before. Good luck finding what you are looking for.
Sharon