What's new

Replacing colour to Black

Hi I'm a newbie here.
I was trying to replace the colour of the image below to black and grey. I searched google and youtube for tips and ways to do so and yet I can't get the real steps to do it.

eg. From this rose gold and white surface to this black and grey (2nd image)
2.jpg Cover.jpg I heard that photoshop can't replace image colour to black? Is that really? I hope all the gurus will be able to help. Thanks in advance.