As of all the Halo games/books we’ve seen/heard that Sangheili either have gray or a grayish-brown skin color. But is their more skin colors that we don’t know? (pale,black,etc), is it possible for Sangheili to be born with freckles? can they get tattooed or dose it even exist in their home-planet? (possible as a test for pain since getting a tattoo is painful especially in certain areas) not only that, but is their any other eye colors? like (blue,brown,etc), also is each keep or state in Sangheilios, have different Sangheili races? ( like majority of Africa has people with darker skin, and majority of Europe has people with white skin ), hope you all can find a good answer(s) to all these questions.
Glasslands told us that Sangheilli from different areas have different skin tones. Those from the area that Thel 'Vadam is from have darker skin than those from Jul 'Mdama’s region. Each skin tone seen across the games is canon, but the reason we don’t see much variety is simply due to them having one model for each rank/class. As for eye colours, we’ve seen a couple of different ones. Due to retcons, it seems that orange/yellow eyes are universal among the Elites. Thel and Rtas had magenta and green respectively in Halo 2, but Halo 3 and H2A have given them the same eyes as everyone else.