PLAT 18CT on my ring, meaning?

So, I have this ring for a while now. My dad said he found it and so he gave it to me. The ring has 3 diamonds; 2 small ones and 1 large one (like the size of an iPhone camera, the one near the speaker). Also I notice, on the ring it has these words (PLAT 18CT) does this mean anything? (I'm not a jewellery expert so… Any help?)

Its plated
its a cheaper base metal dipped
and it won't be real diamonds
they don't put real diamonds into a dipped setting

Platinum 18 Carat, I think. Or plated 18 carat. 18CT is def 18 carat.

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