You can mix metals. I don't know about the chrome faucet though. are you doing a ss sink? ( I hate ss) You could do a graphite sink or a white enamel sink.
here's brass and nickel and some chrome w/a taj look alike
this is what yours resembles. shown w/matte black, gold and Zia Zellige tile
if you did that, you could mix black and gold. otherwise, I'd just stick w/the chrome for your metal. maybe do some black pendants.
these should work w/yoru stone
But if you want the brass elsewhere, think about switching out the faucet. they aren't that much.
I did a matte black delta for less than 300
my island is wrought iron, and I have walnut accents (along w/the brass)
https://juleptile.com/blog3-kitchen-color-schemes-with-taj-mahal-quartzite
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alder island
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