The Blue Diamond Prelude (Fillies) is a Group 2 Race for two year old fillies conducted by the Melbourne Racing Club.

The Blue Diamond Prelude (Fillies) was first run in 1982 and was won by Olive Branch.

The Blue Diamond Prelude (Fillies) is run over 1100m under Set Weight conditions. It was worth $300,000 in 2024.

The Colts and Geldings Division of the Prelude is a Group 3 Race.

The race was Listed until 1986, then G3 until 2014. From 2015 it has been a G2 race.

Most runnings have been at Caulfield but it was at Sandown when Caulfield was out of play for reconstruction in 1996. It was back at Sandown in 2023.

Several fillies have done the Prelude (F)/Blue Diamond double including Love A Show, Courtza, Lady Jakeo, Alinghi, Samaready, Earthquake, Catchy and Lyre.

Those to do the Blue Diamond Prelude (F)/Golden Slipper double are Courtza and Merlene.

Notable winners of the Blue Diamond Prelude (Fillies) include Lockley's Daughter (1986), Midnight Fever (1987), Startling Lass (1988), Courtza (1989), Lady Jakeo (1993), Merlene (1996), Rose Of Danehill (1997), Piccadilly Circus (1998), Mannington (2000), Halibery (2003), Alinghi (2004), Camarilla (2007), Rostova (2009), Samaready (2012), Guelph (2013), Earthquake (2014), Catchy (2017) and Lyre (2019).

The 2024 Blue Diamond Prelude (Fillies) was won by Hayasugi from Kuroyanagi and Matisse