Corundum Visible Spectra (generally 350 - 1200 nm)

Corundum occurs in several colored varieties. Ruby is red because of its Cr3+ content. Yellow sapphire usually owes its color to O- ions (hole centers) alone or interacting with Fe3+. Blue sapphire derives its color from the Fe2+ - Ti4+ and the Fe2+ - Fe3+ intervalance charge transfer. Green sapphires contain a mixture of the blue and green colors. 

Link to an extensive collection of references to mostly color and visible spectroscopy of corundum

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revised 3-Jul-2022