Does anyone know if PSA grades ceramic cards? Gold Cards?

I have a Nolan Ryan set of Ceramic cards from each of his 1st year of his 4 teams. Cool set....just wondering if I can/shouild have them graded. If so, why?
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randy
they are serial #'d to 5,714, one set per strikeout that he had. I have #405/5714. It's really neat. I was a huge Nolan collector growing up. This was a Christmas gift in around 1993-1995 I think. I'll get a scan up on this post soon.
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