She recorded her biggest success on her next start when she took the Group 1 Pretty Polly Stakes, but failed to reproduce that form in three subsequent races and was retired from the track at the end of the year.
Diamondsandrubies is a bay mare with a white star bred in Ireland by Premier Bloodstock, a breeding company owned by John Magnier of the Coolmore Stud and Richard Henry.
Quarter Moon's dam Jude showed little ability as a racehorse, failing to win in four starts[4] before being sold to Premier Bloodstock for 92,000 guineas as a three-year-old.
Jude's dam Alruccaba was an influential broodmare whose other descendants have included Alborada, Allegretto (Prix Royal Oak), Aussie Rules (Poule d'Essai des Poulains) and Albanova (Preis von Europa).
Starting a 22/1 outsider she made steady progress without ever looking likely to win and came home sixth of the thirteen runners, just over nine lengths behind the winner Tamadhor.
[7] Nine days later the filly was moved up in class and distance for the Listed Salsabil Stakes over ten furlongs at Naas Racecourse and was made the 5/2 joint-favourite alongside the Jessica Harrington-trained Bocca Baciata.
Ryan Moore took the mount when Diamondsandrubies was sent to England on 6 May to contest the Cheshire Oaks over eleven and a half furlongs at Chester Racecourse.
Starting the 5/4 against nine British-trained opponents she tracked the front-running Sweet Dream before accelerating into the lead a furlong out and pulling clear to win by six lengths from the John Gosden-trained Entertainment.