Diamond Necklace Arc Odds Rise After Nassau Stakes Win 2026

Diamond Necklace's impressive Nassau Stakes victory has propelled her into the Prix de l'Arc de Triomphe conversation, with odds now at 10-1. This win extends her unbeaten streak to six races and solidifies her status as a top contender in European racing.

Diamond Necklace's Dominant Performance at Goodwood

Under jockey Ryan Moore, Diamond Necklace cruised to a two-and-three-quarter length victory over Friendly Soul in the Nassau Stakes. The win was her fourth Group One triumph, showcasing her exceptional talent at 10 furlongs. Her trainer, Aidan O'Brien, praised her consistency, noting she has "danced every dance" this season.

The race unfolded as expected, with Diamond Necklace settling behind the pace before making her move in the final quarter-mile. Her effortless acceleration left rivals struggling, and the victory was never in doubt. This performance has led bookmakers to adjust her odds for the Arc, placing her as the third favorite behind Daryz and Constitution River.

Arc de Triomphe Prospects and Stamina Questions

The Prix de l'Arc de Triomphe, run over 12 furlongs at Longchamp, presents a new challenge for Diamond Necklace, as her stamina at that distance remains untested. However, history is on her side: fillies and mares have won nine of the last 15 runnings of the race. O'Brien remains open to the possibility, stating, "It is possible. I don't know how far we ask her to go, but the next run will tell us."

Her immediate options include the fillies' race at Deauville in August or a potential Arc trial at Leopardstown. The decision will depend on how she handles the step up in distance, with the team keen to see her progress before committing to the October showpiece.

Comparison: Diamond Necklace vs. Other Arc Contenders

Key Takeaways from Diamond Necklace's Victory

• Unbeaten in six races, with four Group One wins
• Now third favorite for the Prix de l'Arc de Triomphe at 10-1
• Stamina at 12 furlongs remains a question, but historical trends favor fillies
• Trainer Aidan O'Brien is considering multiple options before the Arc

What's Next for Diamond Necklace?

O'Brien has indicated that Constitution River remains the stable's top Arc hope, but Diamond Necklace's trajectory suggests she could be a serious contender. The next race will be crucial in determining her path, with the team prioritizing her well-being and long-term career.

Racing fans and bettors alike will be watching closely as Diamond Necklace's connections decide whether to test her at 12 furlongs. If she takes to the distance, she could be a formidable force in the Arc and beyond.

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