According to Tuffnell's website, Ossa is the first of DH glass's "new speckled lustres". The rods are very unusual, heavily textured with little bumps that are apparently "thousands of refractive inclusions". When heating the glass, I found it can be prone to boiling, but this didn't appear to affect the bead.
It reduces quite easily and seems to prefer oxygen down rather than propane up, but that may just be because I work hot with two oxycons. Unfortunately I think I tend to be a bit heavy handed with reduction glasses and get a lot of yellow streakiness rather than subtle mother of pearl! I do like this little encased bead though, it reminds me of the brass wire effect with tiny golden bubbles.
I thought a tornado bead would be a good style to show Ossa both reduced and not. There's lots of free tutorials around if you want help with this technique.
Simple surface reduction results in very shiny beads!
On the whole, Ossa makes me think of goldstone with the benefit of metallic effects. I think these disc beads really do the glass justice.
A nice photo to finish with ... The top of a wave bead - you can't see the bottom, but it's lovely and shiny.