A cloud hangs over one of only three previous Jewels winners heading to Cambridge for Saturday's $1.275 million meeting.
Because after stopping to a walk at the Pukekohe workouts on Saturday, Partyon will need to pass a vet test on Wednesday to be allowed to start in the four-year-old Diamond.
Only Partyon, Enghien and Dizzy Miss Lizzy go into Saturday as past Jewels winners, Partyon's story the most remarkable as she won the two-year-old Diamond two seasons ago at only her second start.
While that was a dream result, this week's preparation has turned into a nightmare.
She suffered atrial fibrillation at the Pukekohe workouts on Saturday and while many horses recover from that problem and go on to race at, or close to, their peaks at their next start, it is hardly ideal for Partyon.