Diamond Necklace won the Nassau Stakes at Goodwood on Thursday, extending her unbeaten record to six races [1].

The victory establishes the filly as a primary contender for the Prix de l’Arc de Triomphe at Longchamp, one of the most prestigious prizes in global horse racing.

Trainer Aidan O’Brien said the win marks the filly's fourth Group One prize [1]. The performance at Goodwood Racecourse in England reinforces the horse's dominance in the current season. O'Brien said the team is now looking toward the autumn schedule to maximize the horse's potential.

"Diamond Necklace might go for an Arc trial en route to Longchamp", O’Brien said.

The decision to pursue a trial race would be a strategic move to ensure the horse is peaked for the Longchamp event. This progression follows a trajectory of consistent success, with the horse maintaining a perfect record across six starts [1].

Goodwood is known for its challenging terrain, and the win suggests Diamond Necklace possesses the versatility required for the Longchamp track. The racing community now views the filly as a serious threat to the established leaders in the division. O'Brien's cautious approach regarding a trial race reflects the high stakes associated with the Arc.

Diamond Necklace won the Nassau Stakes at Goodwood on Thursday, extending her unbeaten record to six races.

A perfect record of six races and four Group One wins places Diamond Necklace in an elite bracket of thoroughbreds. By targeting the Prix de l’Arc de Triomphe, the O'Brien stable is attempting to transition the filly from a dominant regional force to a global champion, a move that requires precise timing and a successful trial run to handle the specific demands of the Longchamp course.