Oh my. We do need the right tool for the right project.
Opalship, I can't find anything on the Inland web site identified as "flexable inland diamond belt jig saw scrolling cutter." There is a band saw. Is that what you mean?
OK, starting small, I have some 40 mm (1.5 inch) Dremel diamond saw blades. They are .02 thick.
I have never seen an opal big enough to need an 8 inch blade. The biggest problem is that a blade that diameter has to be very thick and that WASTES opal. What is really needed is about the thinest saw blade available. Pick something in the 4 inch size that is .009 to .015 inch thickness. These are so thin they are very flexible but they don't waste opal. Like this
http://cgi.ebay.com/BUTW-2-4-New-thin-d ... dZViewItem
For a much longer lasting but slightly thicker blade. .04 inches, try one like this
http://cgi.ebay.com/4-100mm-Diamond-coa ... dZViewItem
(if that link is dead, search ebay for "THK Diamond tools" or search ebay for "4" Diamond cutting "
If you are cutting slabs of larger or harder rock, find a friend that is a garage sale fanatic and ask them to pick up a used 4" wet tile saw. Show photos first or print one out for them to carry around. You can find these used for $15-30 and you are good to go. The Inland diamond band saw is $240.
The Pixie is a great tool, if you have $1000 to spend.
I think if you are just getting started, spend carefully before you invest big money.
(Why is this discussion under MINING? This belongs under CUTTING or BEGINNERS)
Mauibuck