Is a diamond a porous stone?

I bought jewelry cleaner that says it is safe on porous stones. Is a diamond a porous stone?
Update: It says "This formula contains no butyls, phosphates, bleach or ammonia. It is safe for use on all porous stones, such as pearls, opals, coral, onyx, and turquoise." I bought it to clean my engagement ring but I don't want to ruin it.
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