Pricing spectrolite

does anyone know any good guidelines for pricing spectrolite? I
tried googling cabs online and they run anywhere from $20 to over
$2000 without seeing a really good per carat/quality pattern out
there. I just broke out some old stock material and cut some really
nice ones and I want to use some in my work and sell some as I’m
setting up a cab site…but want a reasonable price on them…and
a price to put in my formula for pricing my jewelry containing them.

If you want to see some of them, I posted an album on facebook. They
are there, together with some other material I have cut in the last
week or so: