
Natural gemstones
Geologic environment
Gemstones occur in most major geologic environments.
Mineral gemstones
Birthstones
Organic gemstones
Buyer beware
Since 1935, the mining of gemstones in the United States has been almost entirely a recreational activity of mineral collectors and hobbyists.
The 1990 U.S. output of natural gemstones was primarily from Tennessee, California, Arizona, Arkansas, Montana, Nevada, and Maine.
Gemstones: Value of U.S. production vs. imports, 1986 and 1989
In this engaging guide, listeners discover the fascinating world of natural gemstones, from the glittering diamonds and sapphires to the more modest yet beautiful semi‑precious stones. The narration walks you through what makes a gem precious—its beauty, durability, and rarity—while explaining the basic science of minerals, gemologists, and lapidaries. You'll learn how gemstones form in diverse geological settings such as pegmatites, stream gravels, and metamorphic rocks, and why they are often scattered in tiny pockets rather than large veins.
The program also dives into the practical side of gem hunting, describing how collectors locate and identify stones in riverbeds and outcrops across the United States. Detailed discussions of hardness, specific gravity, and the Mohs scale give listeners the tools to evaluate a gem’s quality, while vivid descriptions of classic mineral groups—beryl, chrysoberyl, corundum, and more—bring each crystal to life. Whether you’re a seasoned lapidary or a curious newcomer, the audio journey equips you with a solid foundation to appreciate the science and beauty behind every sparkle.
Language
en
Duration
~25 minutes (24K characters)
Publisher of text edition
Project Gutenberg
Credits
Produced by Stephen Hutcheson, Dave Morgan, Carol Spears and the Online Distributed Proofreading Team at http://www.pgdp.net
Release date
2015-01-16
Rights
Public domain in the USA.
A scientific agency rather than an individual author, this name represents the U.S. Geological Survey, the federal organization behind generations of maps, earth science reports, and research on natural hazards and resources. Its publications are shaped by a long mission to help people understand the land, water, ecosystems, and geology of the United States.
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