Ridasiyna came from well off the pace to land the Prix de l'Opera Longines at Longchamp.
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Niall McCullagh set a strong pace aboard proven mudlark Manieree in the 10 furlong Group One contest and had the field well strung out behind as he entered the straight.
Manieree was soon treading water leaving William Buick and Izzi Top - who had led the chasing pack - to take up the running possibly sooner than ideal but with victory still appearing to be on the cards.
However, the Christophe Lemaire-ridden winner - unbeaten until her last-time-out defeat in the Prix de la Nonette - finished with a rare rattle from off the pace to cut down the favourite some way from the post to take the honours for trainer Mikel Delzangles.
Izzi Top just held on for second ahead of the Falmouth Stakes winner Giofra (who did well to make up the ground to get into contention for minor honours having raced in rear) and Pirika.
Delzangles said: "She showed she was a good filly in previous races but we were disappointed with her last run when everything went wrong.
"I was worried like everybody is about the ground, but she didn't mind it and she was happy because they went a good pace. We've got plenty of races to think about now but nothing has been decided."
Gosden said of Izzi Top: "She's got a lot of speed and got bogged down in the ground. She can handle this ground but it's not her favourite. Today was all about specialists handling the conditions.
"There might be one more race for her, not the Breeders' Cup. We'll talk to the owners and see how we get on."