Its one of those cocktail watches from the eighties, very popular then among women. Looks (possibly) genuine, but it rings an alarm bell a white gold watch with an stainless steel back. To be sure you'll have to open the back and send us pics of the inside of the back and the movement. Also, taking it to a jeweler and testing the gold would be a good idea. I.E. look at this one:
https://www.swisswatchexpo.com/watc...dies-18k-White-Gold-2-ct-Diamond-Coctail-9606
The back is also gold.
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