That material is just a little different than the stuff the shells are
pulled from. As for the green jewel, yes, that's one of the actual
jewels for the kit. If you look at the picture in "the Making of Star Trek,"
you'll notice that the jewels are not all the same size. Also in that pic,
you can see that one of the jewels (the large one) is an AB style
stone, and the other two are not. It's a B&W picture, but you can
still tell by the way the light reflects off of it. You can also see that the
stone on the right is very dark, and the center one is considerably
lighter-and lets a lot of light through. Based on my research, I think
it's a pretty safe bet that what we're looking at in that old pic is
probably just another example of the reoccurring green, amber, and red
jewel color scheme.
Of course if you wanted something different on your Comm, you could
just use whatever rhinestones you want
Thanks.
John Long
www.saucersoverhollywood.com