Tag Archives: gemology. gemmology

Pleochroism is visual property that only occurs in double refractive gemstones. The are some gemstones like Tourmaline, Tanzanite and Ioloite that have very obvious pleochroism. But what is it? A picture says a thousand words so lets have a look at an example of Tanzanite.   This is the same piece of Tanzanite looking through […]