This marble has a vortex with 2 dichro canes spiraling down with a chunk of black opal deep down inside that has every color of the rainbow- check the close ups! There is gold and silver fume in between the canes that is a nice green and blue/ white. On the back is black with a spiral of gold and silver fume that has wonderful blues and greens within. Measures approximately 1 9/16" and is discreetly signed "KCN 09".