Opal Gem is a thoroughbred horse born in Australia in 2017. Race horse Opal Gem is by Ready For Victory (AUS) out of Ausmaid (AUS) , trained by John Macmillan. Opal Gem form is available here. Owned by Dr J K Sinclair, Dr K W Fryer, Mrs B A Fryer, Miss A M Robertson, Mrs D J Jacobs, A L Foran, Ms B J Sinclair, J B Hughes, Mrs A K Clayton & M J Clayton.