| Class | Group 3 |
|---|---|
| Location | Caulfield Racecourse, Sandown Racecourse |
| Inaugurated | 1982 (Listed race) |
| Race type | Thoroughbred |
| Sponsor | Sportsbet (2026) |
| Race information | |
| Distance | 1,100 metres |
| Surface | Turf |
| Track | Left-handed |
| Qualification | Two year old colts and geldings |
| Weight | Set weights - 55½ kg |
| Purse | $350,000 (2026) |
The Blue Diamond Prelude (Colts and Geldings) is a Melbourne Racing Club Group 3 Thoroughbred horse race raced under set weight conditions, for two-year-old colts and geldings, over a distance of 1100 metres at Caulfield Racecourse in Melbourne, Australia in February.
The race is a major preparatory race for the rich Blue Diamond Stakes held two weeks later.
Colts that have captured the Blue Diamond Prelude – Blue Diamond Stakes double:
Rancher (1982), Bel Esprit (2002), Sepoy (2011), Written By (2018)
The following are winners of the race.