The Blue Diamond Stakes is a Group 1

Group races

Group races are the highest standard of Thoroughbred horseraces in Australia. The Australian Pattern Committee recommends to the Australian Racing Board which races shall be designated as Group races...

 Thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 horse race for two year olds, at set weights, run over 1200 metres at Caulfield Racecourse

Caulfield Racecourse

Caulfield Racecourse is one of Melbourne, Australia's best-known horse-racing tracks. Commonly known as "The Heath" by local racegoers, it is located eight kilometres from the Melbourne CBD, on the boundary of Caulfield and Caulfield East in Melbourne's south eastern suburbs...

 in Melbourne

Melbourne

Melbourne is the capital and most populous city in the state of Victoria, and the second most populous city in Australia. The Melbourne City Centre is the hub of the greater metropolitan area and the Census statistical division—of which "Melbourne" is the common name. As of June 2009, the greater...

, Victoria, Australia. The race was first run in 1971 and is Victoria's richest two year old race with total prizemoney of A$1.0 million. The Group 3

Group races

Group races are the highest standard of Thoroughbred horseraces in Australia. The Australian Pattern Committee recommends to the Australian Racing Board which races shall be designated as Group races...

  Blue Diamond Prelude C&G

Blue Diamond Prelude C&G

The Blue Diamond Prelude is a Group 3 Australian thoroughbred horse race held under set weight conditions, for 2 year old colts and geldings, over a distance of 1100m. It is held at Caulfield Racecourse in Melbourne...

 and Blue Diamond Prelude Fillies

Blue Diamond Prelude Fillies

The Blue Diamond Prelude is a Group 3 Australian Thoroughbred horse race held under set weight conditions, for two year old fillies, over a distance of 1100 metres. It is held at Caulfield Racecourse in Melbourne...

 are lead up races to the Blue Diamond Stakes.

In 2008, with his victory on the David Hayes trained Reaan. jockey Dwane Dunn achieved the rare feat of winning his fourth consecutive Blue Diamond Stakes.

The winners

• 2011 - Sepoy
• 2010 - Star Witness
• 2009 - Reward For Effort
• 2008 - Reaan
• 2007 - Sleek Chassis
• 2006 - Nadeem
• 2005 - Undoubtedly
• 2004 - Alinghi
  Alinghi (horse)
  Alinghi is an Australian Thoroughbred racemare who won four Group One races, including the Newmarket Handicap and A$4,161,740 in prizemoney. She was by the leading sire, Encosta De Lago from Oceanfast by Monde Bleu...
  
  
• 2003 - Kusi¹
• 2002 - Bel Esprit
• 2001 - True Jewels
• 2000 - Road To Success
• 1999 - Redoute's Choice
  Redoute's Choice
  Redoute's Choice was a multiple Group One-winning Australian Thoroughbred racehorse and is now a champion sire. He is by the phenomenal international sire Danehill out of the lightly raced mare Shantha's Choice...
  
  
• 1998 - Danelagh
• 1997 - Knowledge
• 1996 - Paint
• 1995 - Principality
• 1994 - Hurricane Sky
• 1993 - Lady Jakeo
• 1992 - Riva Diva

• 1991 - Canonise
• 1990 - Mahaasin
• 1989 - Courtza
• 1988 - Zeditave
• 1987 - Midnight Fever
• 1986 - Bounding Away
• 1985 - Let's Get Physical
• 1984 - Street Cafe
• 1983 - Love A Show
• 1982 - Rancher
• 1981 - Black Shoes
• 1980 - Aare
• 1979 - Star Shower
• 1978 - Manikato
  Manikato
  Manikato was a champion Australian Thoroughbred racehorse of the late 1970s and early 1980s. He established new track records in three races and was inducted into the Australian Racing Hall of Fame...
  
  
• 1977 - Blazing Saddles
• 1976 - Out Of Danger
• 1975 - Lord Dudley
• 1974 - Forina
• 1973 - New Gleam
• 1972 - John's Hope
• 1971 - Tolerance

¹Roedean 1st, later disqualified for returning a positive swab

Equine drug testing

Racehorse drug testing began in the early 1900s. It is the longest established, broadest in scope, and possibly the most sensitive drug testing program in existence. Racehorse drug testing is performed within an extremely stringent regulatory context...