December Diamond is a thoroughbred horse born in Australia in 2017. Race horse December Diamond is by All Too Hard (AUS) out of Christmas Offer (AUS) , trained by Paul Jenkins. December Diamond form is available here. Owned by B T Mawby, P Thorpe, C G Nicholson, S R Griffin, P A Miskell, B L Hannon, Mrs T L Hulme, Mrs A C Clive, Mrs LA Mawby, D Casey, P Carroll, G R Field, Mrs J G Artis, C Harris, S L Barrass, T Wood, Ms H Cummins, Prebblebrook (Mgr: D Middlebrook) & D & S Racing (Mgr: J Dore).