Possible Clues:

• Scott's diamonds cut with ease, perhaps
• Hardy --, winner of the Champion Hurdle in 2004 and 2005
• The --- Diamonds (Trollope)
• Girl returned on time with ace - of diamonds?
• The - - Diamonds (Trollope)
• Lizzie hung on to these diamonds
• Cooper's groovy creation - hear sounds of triumph
• Chap found hanging round Euston Place
• Hartleyan shrimp
• Owner of Trollope's diamonds cut with ease perhaps?