| Class | Group 1 |
|---|---|
| Location | Caulfield Racecourse |
| Inaugurated | 1971 |
| Race type | Thoroughbred |
| Sponsor | Sportsbet (2026) |
| Race information | |
| Distance | 1,200 metres |
| Surface | Turf |
| Qualification | Two year old |
| Weight | Set weights colts and geldings – 56+1⁄2 kg fillies – 54+1⁄2 kg |
| Purse | $2,000,000 (2026) |
The Blue Diamond Stakes is a Melbourne Racing Club Group 1 Thoroughbred horse race for two-year-olds, at set weights, run over 1200 metres at Caulfield Racecourse in Melbourne, Victoria, Australia.
Prizemoney was increased from $1 million to $1.5 million in 2016 and to $2 million in 2023.
In 1996 the event was held at Flemington Racecourse due to reconstruction of Caulfield Racecourse. In 2023 the race was run at Sandown Racecourse.
The following are past winners of the race.
† Roedean finished first but was later disqualified for returning a positive swab