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Close-up of a Red Abalone (Haliotus rufescens) shell, 9 September 2025

ADDENDUM (12 September 2025): There were a couple of requests to show more of the abalone shell.  In this case, the original photo was just a section of the rim of a shell, but here's the photo without any cropping:

 

  

P.S.  Note that I've found that the lighting matters a lot when photographing abalone iridescence.  Overcast days bring out the colors the most.