Well, the depth of focus is crap, so it's pretty fuzzy. I had to sacrifice the focus depth in order to get the view close enough to show the colors. Since you're looking for flashes of light, I guess the fuzziness isn't as obscuring as it might be for... text, or somesuch.
1. Queensland boulder opal chip
2. Boulder matrix, jeweler finished. (Crimson, blues, greens)
3. Boulder matrix, jeweler finished. (Blues, greens)
4. Boulder chip, raw
5. Crystal opal? raw (semi-matte, light blue fire)
6. White/milk opal (the only opal here that was meant for normal jewelry)*
7. Black opal, raw
8. Black opal, raw (uber-uber-matte)
9. Black opal, raw (I'm pretty certain it's black opal, even if you think it's not)
*I got this in the best deal ever, but I probably can't mount this for jewelry till I accumulate some standard lapidary tools and skills. Traditional gem-working is a very, very expensive hobby.