Physical Properties of CorundumChemical ClassificationOxideDiaphaneityTransparent to translucent

Can corundum be clear?

Pure corundum is colourless and clear if transparent or pale white if opaque. This mineral also has low dispersion so the value of the stones comes not from fire generated (as in diamond), but rather from the intensity of colours seen.

What is gemstone transparency?

Gemstone transparency is a way of describing how much light, if any, a gem can transmit and how scattered that light is when it exits the gem. Behind this transparent, beautifully carved aquamarine horse head, you can see the texture of the background, including the paper.