The Jewelled beetle, or Chrysina gloriosa, is coloured a brilliant green. Interestingly, they have no green pigment in the cells of their exoskeleton. Only now have scientists discovered how the beetles have this colour. Microscopic cells on the outer layer of the exoskeleton make the beetle appear green under light that is polarized in one direction.
So now let’s do a little physics. Polarisation is the certain orientation of light waves. White light is a mix of randomly polarised light.
The microscopic cells on the beetle are helical to reflect light polarised in the same direction of the spiral. The colour produced by the cells is determined by the size between the turns of the helices, and obviously the distance between the turns on these cells corresponded to green.
The Cosmic Perspective
The scarab sparkles:
a jewel amongst the dust.
Green under the blue.