Chatoyancy shader

Hello! (: I made a cat’s eye effect in shader nodes. This phenomenon occurs due to tiny parallel inclusions of mineral within the gemstone.
Screenshot from 2025-07-03 14-28-43

I recreated this effect with anisotropy and by manipulating tangent

some variations
Screenshot from 2025-09-04 16-06-59Screenshot from 2025-09-04 16-07-46

and a quick render:

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