Black Pearl - arrr Meti - this is the Black Pearl you've been wanting.
Looks pretty much like Nyx to me. Reduces to a metallic teal - and reduces easily.
Didn't kiln-strike for me the way Nyx does, however. An un-reduced bead (the black one with the blue marker) went on black and stayed black.
The saucer bead was reduced, encased and shaped - unfortunately, I "un-reduced" it in the encasing process and it has some colour, but is mostly just very, very dark.
However, the big spiral disk reduced up a treat and has some wonderfully rich blues, more blues than teals. Not sure if this is because the flame slides over the sides instead of hitting it straight on. Anyway - it bears further investigation and experimentation.