The Diamond Master

In Short

The Diamond Master is an inventive mystery of the Edwardian era that blends high-society intrigue with early science-fiction ambition. When a mysterious benefactor known as E. van Cortlandt Wynne begins distributing flawless, large-carat diamonds to the heads of five major New York jewelry firms, he triggers a frantic corporate hunt for his source. The story balances a classic detective investigation against a breathtaking technological secret. It remains a fascinating relic of the period, capturing the anxieties of a world where traditional value could be upended by a single, revolutionary invention.

The Story

The narrative opens with Mr. Harry Latham, a prominent jeweler, receiving an anonymous package containing a perfect, massive diamond. Soon, he discovers that four of his rivals have received identical stones. The sender, E. van Cortlandt Wynne, eventually orchestrates a tense meeting with these five magnates, where he reveals his true purpose: he possesses an "unlimited supply" of diamonds and is prepared to either flood the market—thereby destroying the industry’s value—or sell his entire reserve to them for one hundred million dollars.

Wynne’s calm confidence draws immediate suspicion. The jewelers hire detectives to track his every move, leading to a sophisticated game of cat-and-mouse. Wynne maneuvers through Manhattan with uncanny precision, baiting his pursuers while managing a volatile secret life. The mystery deepens when a vagrant named Red Haney is arrested with a handful of uncut diamonds, and an elderly man associated with the mystery, Mr. Kellner, is found murdered. The police, led by the diligent Mr. Birnes, focus their investigation on Wynne’s associate, the expert Mr. Czenki, suspecting him of the crime.

As the investigation reaches a fever pitch in the rural town of Coaldale, Wynne intervenes to protect his interests and his fiancée, Doris Kellner. It is revealed that the elderly victim was the original source of the gems, having labored in isolation to perfect a method of creation. Wynne ultimately brings the skeptical jewelers to a hidden, soundproof chamber deep within an abandoned coal mine. There, he displays a massive, complex steel apparatus—a feat of engineering that uses electricity and scientific pressure to synthesize diamonds. Faced with the choice of ruin or cooperation, the jewelers agree to Wynne's terms. The story concludes with the legal closure of the murder case against Haney and the cold, pragmatic realization by the jewelers that their industry’s survival now rests entirely on their ability to suppress the miracle of the great cube.

How It Unfolds

The gift of stones. Latham and his peers receive mysterious diamonds by mail, setting the city's most powerful merchants into a panic about the potential source of these perfect gems.

The ultimatum. Wynne forces a meeting with the jewelers, calmly threatening to bankrupt them by saturating the market unless they agree to buy his vast supply at his price.

The detective’s pursuit. Mr. Birnes and his agency launch an exhaustive surveillance operation, only to find themselves constantly outwitted by a man who seems to know their every move before it happens.

A murder in the dark. The discovery of a dead man and a tramp carrying rough diamonds turns the corporate mystery into a criminal case, bringing the police directly to Wynne’s door.

The secret revealed. The jewelers are taken to a subterranean bunker where they witness the mechanical, industrial process used to create diamonds, confirming the impossible.

The final pact. The jewelers resolve to accept the deal, choosing to control the supply rather than face the economic collapse that Wynne’s invention represents.

The People

• Harry Latham is the embodiment of the respectable, unimaginative businessman. He is initially motivated by greed and status, but his world is shattered when he realizes his industry is built on a foundation that can be easily bypassed by science.
• E. van Cortlandt Wynne acts as the story’s cool, calculating architect. He is driven by a desire to consolidate power and protect his fiancée, using his invention as a lever to command the respect of the world's wealthiest men.
• Mr. Czenki serves as the emotional anchor. As a master expert, he is the first to grasp the gravity of Wynne’s achievement, shifting from professional detachment to a state of near-manic awe at the "miracle" of the invention.
• Mr. Birnes is the relentless professional detective. His desire to solve the mystery is fueled by the humiliation of being consistently toyed with by Wynne, and he represents the law’s frustrated attempt to make sense of a crime that operates outside normal parameters.
• Doris Kellner represents the personal cost of the obsession with diamonds. Her struggle against the greed surrounding her family's secret provides the human stakes for Wynne’s cold, financial plans.

In Its Own Voice

"There were thirty or forty personally addressed letters, the daily heritage of the head of a great business establishment; and a plain, yellow-wrapped package about the size of a cigarette-box, some three inches long, two inches wide and one inch deep."

This opening establishes the mundane, professional setting that is suddenly interrupted by the arrival of the first mysterious diamond.

"Think of the mind that achieved it, man!"

Mr. Czenki expresses the overwhelming, existential shock felt by the experts when they finally realize the implications of manufacturing diamonds.

"Think of it, Laadham, der alchemisds tried for dhree thousand years to make a piece of gold so big as a needle-point und didn'd; und he made diamonds so big as your fist mit a liddle cordide und some elecdricity!"

Mr. Schultze captures the profound, almost religious sense of wonder at the technological power Wynne wields.

What It's Really About

The book explores the fragility of artificial value. It questions what happens to a society that bases its economy on the scarcity of an object when that scarcity is proven to be a myth. Through the lens of the diamond trade, the narrative examines the tension between human ingenuity and the rigid systems of commerce. It asks whether the truth, if sufficiently world-altering, should be shared or buried to preserve social order. Ultimately, it is a story about the intersection of scientific progress and the corrupting nature of absolute control, forcing the reader to consider whether a "miracle" is worth the price of the chaos it creates in the marketplace.

Why Read It Today

Readers who enjoy the brisk, procedural pace of early 20th-century mystery novels will find this a compelling read. It captures the essence of a "gentleman’s" thriller—men in offices, quiet conversations, and a growing sense of intellectual dread. The prose is clean and efficient, typical of the era, and the mystery moves with a satisfying, logical progression.

However, modern readers should be prepared for the period-typical dialogue, particularly the phonetic spelling of the German character Schultze’s speech, which can be taxing. The book also reflects the rigid, class-conscious sensibilities of its time, where detectives and businessmen operate in a closed loop of influence. Despite these period trappings, the core concept—a man who breaks the diamond market—remains remarkably potent. If you are drawn to stories where scientific discovery threatens to undo the foundations of capitalism, you will find the final reveal of the "great cube" both haunting and fascinating. It is a brisk, clever piece of entertainment that lingers in the mind, serving as an early ancestor to the modern techno-thriller.