Is the purplish "graphite" color of back shell of Xiaomi Redmi 5s normal?

I got my graphite 5s today, but the back shell is more towards purple than black. "Purple grey" or "Pearl purple". Anybody experienced this as well? Is it a common experience with this color or did I just receive a "special" unit? Is it legit or do I have a right to be concerned about the authencity or quality of the phone?

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