The Question and Answer section for She Stoops to Conquer is a great resource to ask questions, find answers, and discuss the novel.
Check out "Behavior/Appearance" at the GradeSaver link below:
Diggory is the head servant at the Hardcastle's estate.
Tony shows Hastings the cache of jewels he has stolen. Hastings is worried because Constance has just about convinced Mrs. Hardcastle to give them to her.