Synthetic crystals of corundum and YAG

This is a reference image of my synthetically-grown crystals of corundum and YAG. The vertical height of the image is 10cm.

 

Clockwise from the top left:

 

Corundum (alexandrite) purple: chromium and vanadium? (viewed perpendicular to optical/c-axis)

 

Corundum (ruby) deep red: chromium (viewed perpendicular to optical/c-axis)

 

Corundum (sapphire) yellow: ??

 

YAG? light lavender: neodymium

 

Corundum (ruby) red/purple: chromium (viewed along optical/c-axis) Verneuil

 

Corundum (sapphire) uncoloured Verneuil

 

YAG: neodymium

Done