Diamond Necklace Arc Odds Soar After Nassau Stakes Win 2026

Diamond Necklace's Prix de l'Arc de Triomphe odds have shortened to 10-1 after a dazzling Nassau Stakes victory at Goodwood, extending her unbeaten record to six races. The four-year-old filly cruised to a two-and-three-quarter length win under Ryan Moore, cementing her status as one of Europe's top middle-distance performers.

Diamond Necklace's Nassau Stakes Dominance

Thursday's Group One success was her fourth at the highest level, and her first start since a narrow nose victory in the Prix de Diane at Chantilly in June. At Goodwood, she made the race look effortless, sweeping past Friendly Soul inside the final quarter-mile to win with authority.

Trainer Aidan O'Brien was full of praise: "Diamond Necklace is a lovely filly who has danced every dance." He confirmed that the Arc remains a possibility, though a decision will be made after her next run, likely at Deauville or Leopardstown.

Arc de Triomphe Betting Market

The current Arc de Triomphe betting sees Diamond Necklace as third favourite behind Daryz, last year's winner, and stablemate Constitution River, who is the clear "boss" according to O'Brien. Constitution River, winner of the French Derby and Eclipse Stakes, is heading to York for the International Stakes.

While Diamond Necklace's stamina for the 12-furlong trip is untested, history is on her side: fillies and mares have won nine of the last 15 runnings of Europe's most prestigious middle-distance race.

Key Takeaways for Racing Fans

• Diamond Necklace is now 10-1 for the Arc, with strong each-way appeal.
• Her unbeaten record and Group One pedigree make her a serious contender.
• O'Brien's next move will be crucial; a step up in trip is the main question.
• Fillies have a strong recent record in the Arc, boosting her chances.

FAQ

With the Arc still months away, Diamond Necklace's next run will be pivotal. If she handles the step up in trip, she could be a serious each-way player at Longchamp. For now, her Nassau Stakes performance has put her firmly on the radar for Europe's biggest prize.

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