A limbal ring is a dark circle around your outer iris. See below for examples. Then let's see how prominent they are.
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@CinnamonGirlE Yep. It gives my otherwise quite blue eyes a slightly greyer appearance until you take a closer look.
@stueytheround
I see it though. They can sometimes fade as we age. Your looks pretty prominent.
@CinnamonGirlE The camera doesn't pick it up as well as when I look in the mirror, but it's there.