pink diamond

LITMost natural pink diamonds owe their colour to a broad absorption band centred near 550 nm (2.2 eV), usually linked to plastic deformation: glide along {111} planes leaves pink "graining". A study of the 9.01 ct Grand Condé found the 550 nm band without visible graining, so the link is not one-to-one. The Argyle mine in Western Australia, the main source, closed in 2020 (closure date from memory).

COMPUTED2.2 eV = 1239.84/550. MODELThe band width and depth are my choices; deformation strain sets the depth. Tap to shear the lattice. Nesting: a colourless core, pink grain lines, void.

deformation shear

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