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Black is just that black, pearl is more of a white eye.
Around sexual maturity would be a good time to check eye color and leg color.
I disagree with that. If your birds, (Marans), don't have the correct eye color by 6 months, they aren't going to have it. It may slightly deepen in color by a year, but at 6 months, if not before, you should have a "reddish bay" eye color. I liked their (MCCU), previous description of eye color, "pumpkin". Black is black or very dark brown, and pearl constitutes a light greyish color, both of which are DQs. To see the pearl eye color, Google "Cornish" chickens.
ETA: OOPs! I missed the Key word there, "sexual maturity"! Yes, by 6 months, they should have the correct eye and shank color. Shank color usually comes in earlier.