Stainless Steel color palette, or Swatch Need help making one.

Hi, I do laser engraving primarily on Stainless Steel Tumblers. I would like to have a color swatch that I can use to fill vectors, and text to simulate the Stainless look on mockups, and sales pictures. Where do I learn how to accomplish that? I'm not sure of the term I need to be searching for which also complicates things. Thank you