Pleochroism

The property of most doubly refractive colored minerals of exhibiting either two or three different colors when viewed in different directions in transmitted light. Dichroism (two colors) and trichroism ( three colors) are the two categories of pleochroism.
Green Tourmaline and Diamond Halo Ring. The Tourmaline Color is a More Yellow Green from this Crystal Direction - Exhibiting Pleochroism.

Green Tourmaline and Diamond Halo Ring. The Tourmaline Color is a More Yellow Green from this Crystal Direction – Exhibiting Pleochroism.

Green Tourmaline and Diamond Halo Ring. The Tourmaline Color is a More Olive Green from this Crystal Direction - Exhibiting Pleochroism.

Green Tourmaline and Diamond Halo Ring. The Tourmaline Color is a More Olive Green from this Crystal Direction – Exhibiting Pleochroism.