Should the Prix de Diane Longines favourite Diamond Necklace (St Mark's Basilica) comply with all established logic at Chantilly on Sunday and deliver, it will be Classic win number seven in 2026 for Aidan O'Brien in a season he is threatening to define.Already one of the six herself, having conquered the Poule d'Essai des Pouliches with the minimum of fuss four weeks ago, Ballydoyle's unbeaten starlet bids to join an elite band by adding this prestige affair to Longchamp's Classic and Prix Marcel Boussac. Remarkably, just a quartet have achieved that feat in history and two of those were Allez France and Zarkava, who continue to be discussed with suitable reverence. The other pair Divine Proportions and Blue Rose Cen were hardly shrinking violets too and it seems highly likely that we will see Chicquita's half-sister avenge her defeat at the hands of Treve in the 2013 renewal.O'Brien, whose clutch on the season's three-year-old monuments is bordering on a monopoly at present, could offer no negatives this week. “She's good, very straightforward. She's well-balanced and very like her sire,” he said of the blueblood, who bids to complete Ryan Moore's set off English, Irish and French Classics. “When he went up to a mile and a quarter, he improved again and everything she does is very like him really. Obviously, the Diane is a very prestigious race, very important for a filly and a tough race to win. I think she's even better on better ground and we're going to learn more on Sunday.”With 20 wins this century, the Diane has always been one of those Classics in which the French trainers have held their own but the stranglehold is slipping in the modern era despite the last three renewals staying at home. Four of the last eight have gone to England and Ireland and it is disconcerting that Sunday's edition sees just four fillies from domestic stables.One of those is the Pouliches third Green Spirit (Kingman), but the length gap that separated her and Ballydoyle's luminary in the Marcel Boussac had grown to 4 1/2 last time and she has it to do over a trip that may not improve her. England's hopes are far stronger, with Ace Stud's 1,000 Guineas runner-up Evolutionist (Night Of Thunder) joined by James Wigan's Michael Seely Memorial winner Lilt (Lope De Vega) and TBT Racing's Musidora runner-up Felicitas (Teofilo).It is the daughter of the Wigan's high-flyer Dank who excites the most, drawing William Haggas into a notably bold commitment with a filly having only her third start. The wide draw in 10 could have been much kinder, but Lilt could be one of those rarities capable of overcoming the odds.“She's going up in distance, which hopefully will suit her and that's what should bring about some improvement,” Haggas said on Thursday's Nick Luck Daily Podcast. “She's a big filly and she's from a family that do better as they get older. We thought the mile looked the bare minimum for her at York, but she was still classy enough to win. She hit a bit of a flat spot, which I suspect she might do again on Sunday, but she should come home well hopefully. Whether it's well enough, we'll see.”Also on Sunday's card is the G3 Prix Bertrand du Breuil Longines, where last year's Prix du Moulin hero Sahlan (Wootton Bassett) bids to get back on track after a tame eighth in the Lockinge, and the G3 Prix du Lys Longines for the Grand Prix de Paris prospects. Andre Fabre holds the record with 15 wins, but none since Flintshire in 2013 so he'll be looking to either the Wertheimers' Prix de l'Avre scorer Rumoriste (Frankel) or the Niarchos Family's Prix Noailles runner-up Space Waltz (American Pharoah) to end the drought.The post Diamond Necklace Poised For O’Brien’s Magnificent Seven appeared first on TDN | Thoroughbred Daily News | Horse Racing News, Results and Video | Thoroughbred Breeding and Auctions.