No, I don’t think it’s genuine.
the way the diamonds are set doesn’t match the other Cartier example. Your one seems to have an extra metal rim.
It also just doesn’t seem as “crisp” in execution as the other example on Ebay.
But I’m not Cartier expert but I’ve been buying long enough on eBay to tell you fakes abound. Cartier and Tiffany are the most often faked brands.
Price is also an indicator, the other example is $13,000 odd. If yours was alot cheaper, that should be warning sign.
You must buy from trusted and reputable business sellers and you must get the appropriate Cartier box and Cartier receipt otherwise you are taking a big risk.
I don’t know if you can take it into Cartier and ask them to check it, I know Tiffany now refuses to authenticate pieces.