The Diamonds of the title are Justine, Annalise and Charlotte, children of the Duke and Duchess of Manning of Welbourne Manor. The household of the notorious Fitzmannings of Welbourne Manor includes the Duke and Duchess's various children: his legitimate sons by a previous wife, his illegitimate daughter by an unknown mistress, her legitimate son by her first marriage, and their illegitimate daughters born before they married. They share the mansion with fun and enjoyment of each other. The greatest problem is to find a suitable husband for each of the daughters.

In separate novellas: "Justine and the Noble Viscount," "Annalise and the Scandalous Duke" and "Charlotte and the Wicked Lord," the daughters find their own futures and love stories. The common thread in these novellas is the genuine affection they show each other.

The characters are real and likeable. The affection they show each other is heartwarming. The stories provide a picture of the mores and life of that period of time. This is an excellently written anthology which is pure escapism.