Thought it might be good to have some example photos.
Solid Theia, looking pretty dark.
Theia blown out into a vessel, to show it's color as it's thicker or thinner. The bird on top is Theia over a core of clear.
Theia over clear, and in some sunlight.
Opal violet. (Opal violet core, aurae frit, melted in (but not super heated to clear), and cooled a bit before reducing the frit, then encased in clear and shaped into a fish. So these beads did get some striking due to that reduction step, but not the "Heat to clear, super cool, warm again" strike sequence. As I make the fish, the bead does cool off a bit, so there is some mild striking that occurs there as well.
Opal violet, same color combo and process. I think this one is cloudier because I used a reduction glass for the fins/tail, and the cool+reduce gave it some extra striking that the previous fish did not get.