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There are a number of gemstone designs that have some of the facets left unpolished or frosty.

From software I created, the coordinates of each vertex and the equation of every face is known.

This is why I use Boolean Difference to create my gemstones - one facet at a time.

Since I do one facet at a time, is there something that I can do to make the facet frosty like a roughness of 0.2?

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If I understand correctly, you want certain faces of the same object frosty while others are glossy. Is this what you're thinking? If not, please add additional info to the question:

1.) Select which faces you want frosty:

enter image description here

2.) Assign the selected faces a separate shader with roughness of 0.2: enter image description here

enter image description here

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  • $\begingroup$ This is exactly what I was looking for. Thanks a big bunch. $\endgroup$
    – Dick
    Commented Jul 3, 2017 at 20:21
  • $\begingroup$ bertmoog, I would love to mark the question "answered" but I don't know how to do that! $\endgroup$
    – Dick
    Commented Jul 3, 2017 at 22:44

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