Diamond Necklace (3f St Mark’s Basilica - Prudenzia, by Dansili) retained her unbeaten record when landing the Prix de Diane at Chantilly on Sunday. The Ballydoyle-trained three-year-old is now five wins from as many starts, three of those victories coming in Group 1s. She concluded her juvenile campaign with success in the Prix Marcel Boussac last October, while she began this season with an easy win in the Poule d'Essai des Pouliches. Ridden by Ryan Moore, Diamond Necklace settled in midfield and made steady headway from two furlongs out. She took up a narrow lead with a furlong left to run and was ridden out to win by a neck. Aidan O’Brien said: “She’s a very good filly and Ryan gave her an unbelievable ride. “We were happy through the race, it was evenly run, Ryan said he’d take his time as she quickens well and he was over the moon. She’s never run on ground that quick but he said it was no problem. “She’s by St Mark’s Basilica and she’s very like her dad, she’s not big but quickens well and he didn’t want further than ten furlongs so maybe she’ll be the same. “At home in her work when she gets there she doesn’t do much, maybe she doesn’t have to go further. She’s very classy, the sky is the limit. She’s very similar to St Mark’s and like him, she’s stepped up from two to three.” Moore added: “I never thought we were going to get beat. I think she does what she really needs to do. She's very straightforward and was very professional in everything she has done through the race. “At the moment we don’t know what she can’t do as she’s answered every question she's ever been asked. She's so straightforward, a great mover and she's handled bad ground in the Guineas and good ground today. “She was very comfortable on it and she might stay further I suppose. But she has pace.” A half-sister to Irish Oaks heroine Chicquita and fellow Group 1 star Magic Wand, Diamond Necklace was bred by Ecurie des Monceaux and Skymarc Farm.