Sariska, trained by Michael Bell and ridden by Jamie Spencer, cruised to victory in the Darley Irish Oaks at the Curragh to complete a famous Classic double.
Having had to battle all the way to deny Midday in the Epsom equivalent last month, it was a totally different story as the even-money favourite sauntered hard-held all the way up the straight to win with her head in her chest.
Long-time leader Roses For The Lady was a gallant second with Henry Cecil's Midday having to settle for third this time on ground probably softer than ideal.
Bell said: "She had been working so well, and coming into the race I hate to say it but I really thought she would win. That was very, very impressive.
"I think now we will go for the Yorkshire Oaks (August 20) and then sit down and have a serious think about her autumn campaign.
"Obviously she would have to be supplemented for the Arc, but you want to take on the best and she is such a good filly it would be insane not to have a dart at it."
Cecil was magnanimous in defeat, saying: "With the ground she wasn't able to quicken, although I feared the winner would improve and she won very easily.
"I wouldn't want to take her on again and we might go to Goodwood (Nassau Stakes)."
Oxx said: "I don't know what happened to Beauty O 'Gwaun, but the other one is a very tough, genuine filly who loves soft ground. The Park Hill would be the obvious race for her."