A Hand-book of Precious Stones

In Short

This book serves as a foundational manual for merchants, jewelers, and amateurs interested in the properties of gemstones. It systematically catalogues a vast array of minerals—from the diamond and ruby to the humbler quartz and amber—outlining their physical, optical, and chemical characteristics. By emphasizing accessible diagnostic tools like the scratch test and specific gravity measurements, the work bridges the gap between mineralogical science and the commercial jewelry trade, remaining a practical, enduring reference for anyone who wishes to look at a stone and understand its true nature.

The Story

The narrative arc of the book follows a logical progression from the abstract principles of mineralogy to the concrete realities of the marketplace. It begins by establishing the "language" of stones, defining what makes a gem precious. It introduces the fundamental physical properties—such as crystallization, cleavage, and fracture—that act as the bedrock of geological identification. The discussion then moves into the more ethereal realm of optics, where the behavior of light within a crystal provides the key to unlocking its identity. Here, the reader learns that refraction, polarization, and the phenomenon of pleiochroism are not merely physics problems but essential tools for distinguishing high-value gems from their clever imitations.

Once the theoretical framework is set, the text embarks on a comprehensive survey of individual species. It moves through the hierarchies of the stone world, beginning with the elite—the diamond and the corundum family, including the ruby and sapphire. The author treats these entries with a mix of reverence for their rarity and cold-eyed commercial assessment, noting the influence of color, weight, and internal flaws on market value. As the journey continues, the focus expands to include a dizzying array of secondary stones: the beryl, the tourmaline, the opal, and the enigmatic pearl. Each entry functions as a miniature biography of the mineral, detailing its formation, its geographic origins, and the ways in which human artifice—the lapidary’s wheel—unlocks its hidden beauty.

The book does not shy away from the darker side of the trade: the deception. It candidly discusses the ways stones are "faked," whether through the staining of turquoise, the synthesis of rubies, or the labeling of common quartz as something more exotic. The arc concludes by providing the reader with a sense of authority. By the time one reaches the detailed tables of hardness and specific gravity at the end, the mystery has been stripped away. The reader is no longer a passive observer of a sparkling display case but an informed participant capable of conducting tests—using files, magnets, and even simple household chemicals—to verify the integrity of a gem. It is a transition from aesthetic wonder to technical mastery, ending with a complete, if dry, systematic classification of the natural world’s most coveted treasures.

How It Unfolds

The foundation of identification The text opens by stripping away the veneer of jewelry, focusing instead on the rigid, measurable criteria—hardness, specific gravity, and optical refraction—that define a mineral. These technical chapters establish the baseline for all subsequent analysis.

The hierarchy of gems The author then categorizes stones by their rank and value, starting with the diamond and the corundum family. These sections emphasize the scarcity and the specific, often elusive color profiles that dictate extreme market prices.

The diversity of the mineral kingdom The narrative branches out into the wide range of secondary and semi-precious stones, covering everything from the electrical properties of the tourmaline to the organic origins of the pearl. Each entry acts as a standalone reference, grounding scientific composition data alongside common trade names and geographical sources.

The final diagnostic toolkit The work culminates in a series of practical summaries and reference tables. These final pages synthesize the preceding lessons, allowing the reader to cross-reference physical traits to confirm the identity of a specimen, successfully completing the transition from learner to evaluator.

The People

While the book lacks a traditional cast of characters, it is populated by the "merchant," the "workman," and the "amateur." These three figures represent the different ways humans interact with precious stones. The merchant is the pragmatist, concerned with the "pigeon’s blood" color of a ruby and the fluctuations in market price that occur when a stone is flawed or heat-treated. The workman is the lapidary, the artist who holds the rough, unsightly crystal and must decide how to cut it to maximize its fire and brilliance, guided by strict geometric rules for faceting. The amateur is the student, the reader themselves, who holds a glass and a file, hoping to distinguish a true sapphire from a piece of blue glass. Their primary obstacles are ignorance and fraud, and they find their resolution through the application of the book's specific, repeatable tests.

In Its Own Voice

"The weight of an object which is free to seek the centre of gravitation is called absolute weight, while the weight of an object compared with that of another containing the same volume of matter is called the specific weight."

This explanation clarifies the essential difference between simple mass and the density measurements used to identify gems.

"Although a finely developed diamond, ruby, or other crystal is sometimes found and used for jewelry, the beauty of a precious stone generally remains hidden within a rough and unsightly exterior until the lapidary’s art reveals the gem."

This observation highlights the transformative role of the human craftsman in the life cycle of a gemstone.

What It's Really About

At its core, this book is an argument for the superiority of empirical evidence over intuition. It posits that the value of a stone is not found in its myth or its sparkle, but in its physical reality—its hardness, its chemical composition, and its optical behavior. The text grapples with the tension between the natural rarity of a mineral and the human impulse to categorize and commodify it. By exposing the methods used to test stones, the author shifts the power dynamic from the seller to the buyer, suggesting that true appreciation of a gem is inseparable from a deep, scientific understanding of what it actually is, rather than what it merely appears to be.

Why Read It Today

Readers who enjoy the intersection of natural history and industrial trade will find this a fascinating period piece. It offers a clear, unvarnished look at how the Victorian-era jewelry market functioned before the era of modern high-tech gemology. The prose is functional and direct, possessing a distinct warmth that comes from the author’s genuine passion for his subject. While some of the terminology reflects 19th-century mineralogical conventions, and the lack of color photography means the reader must rely on the author’s vivid descriptions of color and luster, the book remains a valuable reference for collectors of antique jewelry or those interested in the history of trade. The detailed lists of geographical origins are particularly evocative, offering a glimpse into a world where stones were still largely pulled from the sands of rivers and the veins of granite by hand. It is a quiet, precise, and practical volume that rewards those who appreciate the physical, tangible history of the objects we prize.