I've been trying to reproduce the northern lights and I cant seem
to find the right material that can give me that look.
Although tiger's eye can be dyed in the colors you're looking for,
I've never seen one piece with all of them together, just one piece
with solid color. Perhaps you shouls consider some of the synthetic
opal that is out there. It is available with different bodycolors,
including black, blue and pink, as well as the standard white. When
viewed from the side, it has a columnar structure that resembles the
aurora borealis (in an abstract sort of way), and contains the
play-of-color you're looking for. A Google search of "Gilson opal
rough" and "synthetic opal rough" yields good results.
James S. Duncan, G.G.
James in SoFL