What colors? Chameleons get different colors based on mood or temperatures. Ill include some photos but green is generally happy, darker colors like teal can be basking colors as the dark colors helps them absorb heat, angry is brown and black.
you can see in some images hes whatever color the environment around him is, ranging from greens, blues, and browns (note the palm tree picture). But if you notice that the one pic with polkadots he is basking, the dots help absorb heat and distribute it around the body. If thats what your cham looks like then its completely normal. I would only be concerned about dark colors if the chameleon is also lethargic, not eating or drinking, and not passing feces.
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I would leave it alone for now, but once he/she settles in work on handling him/her for 20-30 minutes a day. Yes chams do like to be left alone but proper handling can tame a chameleon. Cleo went from biting and hissing me non stop to now he might hiss once and then lets me take him out, and calms down immediately once hes out if his territory. You dont need to know the gender immediately but once you are comfortable with handling, post pics similar to the ones I posted as examples. Make sure they are well lit and not shaky or blurry
today when I put my hand in front of my Cham it walked right on