Dalamus' eyes are red with a brighter red limbal ring, and his scleras are a greyish color. Many describe them as piercing or striking, even with his expression softened.
He and many of his tribe possess a tapetum lucidum in their eyes, which allows for improved vision in low light and at night, though not to the same extent as nocturnal animals. It also causes the pupils to glow with an eye shine at night when sufficient light is seen reflecting from them. The color of the shine varies between individuals, but Dalamus' eye shine is a yellow-orange color. The limbal rings themselves seem to glow slightly at night, too, and combined with the eye shine can be a truly ominous sight in the dark.
His limbal rings are genetic, passed down through his family and in his tribe. Their color depends on that of the parents, although occasionally an ancestor's color gene can slip through and create an unexpected outcome. In Dalamus' tribe, limbal rings can change in intensity depending on how an Au Ra is feeling--glowing in rage or when overjoyed, dimming with despair or illness, etc.
In the case that an Au Ra with genetic limbal rings wishes to hide or change their color (or an Au Ra without limbal rings wishes to have some), the Aesthetician Jandelaine offers such a service, using magic to apply a sort of "contact lens" with the desired color (or lack thereof, to match one's limbal ring to the rest of their eye) on top of the eyes. They take some getting used to, but many are happy with the results, and they're able to be changed again by Jandelaine at any time.
Whether Jandelaine offers limbal ring "contacts" to non-Au Ra is unknown to Dalamus, but seeing those of non-Auri descent with limbal rings would strike Dalamus as odd at best, or disrespectful at worst.