What inspired Anthony Horowitz to name the title of his books about diamond brothers?

Anthony Horowitz has written several books featuring diamond brothers, but there isn't a specific, widely-known inspiration for the name "Diamond Brothers" itself. It's likely that the title is simply a clever and catchy way to describe the main characters, who are:

* In the Alex Rider series: The two brothers, John and Ian Rider, are undercover agents who specialize in diamond-related activities. Their codename is "Diamond Brothers," a reference to their expertise in the diamond trade.

* In the Detective Daniel Hawthorne series: The protagonist, Daniel Hawthorne, is a detective who has a connection to a mysterious figure known as "The Diamond Brothers." The exact nature of this connection is revealed throughout the series.

Horowitz uses the term "Diamond Brothers" to evoke intrigue and mystery, referencing both the brothers' involvement with diamonds and the potential danger they pose. This approach creates a compelling hook for readers, making them curious to discover who these Diamond Brothers are and what their true motives are.