This was reviewed by Mobile Tech
<We tested the phone with the Jawbone and voice dialing worked fine but we heard static even when the headset was only 3 feet from the phone. The
Jawbone II had better range, but voice dialing didn't work (the Jawbone II doesn't work with the
HTC Touch Dual's voice dialing either).>
I have the Jawbone II and also the ear mold for it. Looks like I can't use it with the Diamond.