The Aidan O’Brien-trained filly scored a first victory at Group One level when holding 1000 Guineas winner Legatissimo by a short head in the Pretty Polly Stakes at the Curragh last month.
Diamondsandrubies had previously finished fourth in the Oaks at Epsom, two places behind Legatissimo, but endured a troubled passage that day.
Legatissimo will be in opposition once again at Goodwood along with Prix de Diane victor Star Of Seville, and Richard Henry, part owner and breeder of Diamondsandrubies, knows it will be a tough test.
He said: “Aidan tells me Diamondsandrubies has been in great form since her Pretty Polly Stakes success.
“It looks a particularly strong renewal with a pair of Classic winners in the mix. Goodwood is a pretty unique track but we’re hopeful she’ll handle it.”
Legatissimo’s trainer David Wachman is pleased enough with his filly’s condition but following some ill fortune on her latest start at the Curragh, he is hoping for a little luck this time.
He said: “She seems well and we’re happy enough. If she can stay in one piece we’d have a chance, I hope.”
Star Of Seville is one of three representatives for John Gosden, along with Bright Approach and Jazzi Top, with the Derby-winning trainer bidding for a fourth successive win in the race following The Fugue (2012), Winsili (2013) and Sultanina (2014).
Star Of Seville finished well down the field in the Oaks at Epsom but bounced back to form when creating a minor surprise at Chantilly in the French equivalent of the Oaks.
Jazzi Top was four places ahead of Star Of Seville on her latest start in the Oaks while the four-year-old Bright Approach will be having her first outing since beating only one home in the Ribblesdale Stakes at Ascot last year. The latter is the mount of Richard Hughes, who retires today.
Gosden said: “Star Of Seville obviously ran a great race in the Prix de Diane. We are aware this a high-quality race against some proper fillies though.
“This is Jazzi Top’s trip, as it is for Star Of Seville, and Jazzi will be a better filly than she was in the Oaks. She’s really strengthend up and could be in the shake up.
“Bright Approach has been off for a long time but she’s been working well. I’m delighted Hughesie can ride her in what will be his last Group One.”
Bright Approach is one of two older fillies in the race, with Alain de Royer-Dupre’s Cladocera also flying the flag for the four-year-old team.
Cladocera was a dual Group Two winner at Meydan during the winter and was last seen when finishing third behind Amazing Maria in the Duke of Cambridge Stakes at Royal Ascot.
The trainer said: “Cladocera ran well to finish third at Royal Ascot and that form has been boosted by the winner going on to land the Falmouth Stakes.”
Luca Cumani sends out Oaks third Lady Of Dubai, who claimed the Height Of Fashion Stakes at the track earlier in the campaign — a fact her handler counts as a big plus point.
He said: “She was fine after her run in the Oaks. She is a course and distance winner at Goodwood which counts for a lot.”
Diamondsandrubies’ stablemate Wedding Vow and the David Elsworth-trained Arabian Queen complete the line-up.