Flagmount Diamond sired the half bred Hopes are High who won the 1998 De Maurier Grand Prix at Spruce Meadows with Nick Skelton(GB), in addition to Grands Prix at Dublin and Dijon, and the Team bronze at the WEB the same year. In 1999, Hopes are High won the King George V Gold Cup at Hickstead and was ranked 15th by the WBFSH.  Flagmount Diamond also sired Grade A Showing Jumping stallion Diamond Chin,  who in turn sired Eezy, who won the US Jumping Derby at Del Mar and the Grand Prix of San Diego. 

Flagmount Diamond was ranked in the top 50 Sires of Show Jumpers in the World in 1998-1999 by WBFSH.  He is also sire to the Grade A Show Jumping mare Lady Glen, who herself was dam to John Whitaker's Diamond Cliff who won the speed class at ‘S-Hertogenbosch CSI-A in 2000. 

Flagmount Diamond is the sire of current RID stallions Crosstown Dancer and Mount Diamond Flag and the Damsire to Classic Vision, Supreme Ginger, the sire of the 2nd Dam of the full brothers Sir Rivie and Ryde's Sea Quest.   Flagmount Diamond's progeny have collected an astounding 7,651 Showjumping Association of Ireland points.