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Gemstones of the World


Synopsis


Truly the ultimate one-volume book every hobbyist, jeweler, jewelry maker, and rockhound will ever need! Chock-full of more than 1,500 full-color photos showcasing each precious and semiprecious stone in both its rough and polished state, this bestselling reference book from leading geology expert Walter Schumann will be your go-to identification guide.

Following the spectacular success of the first four editions of Gemstones of the World, the revised fifth edition exhibits important updates and a beautiful new cover. All the gemstones ever discovered are treated here in their many variations. More than 1,500 full-color photos showcase each precious and semiprecious stone in both its rough natural state and its polished and cut renditions. Each entry offers complete information on a stone's formation and structure; physical properties and characteristics; and methods of working, cutting, and polishing.

You'll find full treatments of lesser-known gems and minerals-from andalusite to vesuvianite-and a special section devoted to rocks as precious stones, including alabaster, onyx, obsidian, and fossils. Organic gem materials such as coral, ivory, amber, and pearl are also covered, along with more recently discovered stones like charoite. Additionally, this all-inclusive rocks and minerals book includes imitations, synthetics, and combined stones. Charts and tables help you identify unknown gemstones and-when you're in the market-how to check for authenticity.

Whether you're a beginner rock enthusiast or geologist, or are looking for a crystal book to support your spirituality practice, Gemstones of the World will bring new beauty and wisdom to your bookshelf.

Summary

Chapter 1: The Nature of Gemstones

* Describes the characteristics and properties of gemstones, including their composition, crystal structure, hardness, durability, and color.
* Example: Diamond is a gemstone composed of pure carbon atoms arranged in a cubic crystal structure. It is the hardest known mineral and has exceptional durability and brilliance.

Chapter 2: Gemstone Formation

* Explains the geological processes that form gemstones, including magmatic, hydrothermal, and metamorphic processes.
* Example: Rubies and sapphires are formed when molten magma cools slowly deep underground, allowing crystals to form.

Chapter 3: Gemstone Sources

* Examines the geographical distribution of gemstone deposits around the world, including mines, pegmatites, and alluvial deposits.
* Example: Brazil is a major source of emeralds, while Myanmar (Burma) is renowned for rubies and sapphires.

Chapter 4: Diamond

* Provides a comprehensive overview of diamonds, including their formation, mining, and different types (e.g., colorless, fancy colored).
* Example: A 5-carat, D-color (colorless) diamond from the Kimberley mines in South Africa would be highly valuable due to its exceptional quality and rarity.

Chapter 5: Corundum

* Describes corundum, the mineral that includes rubies and sapphires, and discusses their different hues and color-causing impurities.
* Example: A 3-carat, pigeon's blood ruby from Burma would be extremely rare and valuable due to its intense, deep red color.

Chapter 6: Beryl

* Examines beryl, the mineral that includes emeralds, aquamarines, and heliodors, and discusses their different colors and inclusions.
* Example: A 5-carat, Santa Maria emerald from Colombia would be highly valued for its vivid green color and clarity.

Chapter 7: Quartz

* Explores quartz, the most abundant mineral on Earth, and discusses its different gemstone varieties (e.g., amethyst, citrine, rose quartz).
* Example: A 10-carat, faceted citrine from Brazil would be admired for its warm, yellow-orange color and clarity.

Chapter 8: Topaz

* Examines topaz, a relatively hard gemstone that comes in various colors, including blue, pink, and orange.
* Example: A 2-carat, imperial topaz from Pakistan would be prized for its deep, intense blue color.

Chapter 9: Tourmaline

* Describes tourmaline, a complex mineral that exhibits a wide range of colors, including pink, green, blue, and black.
* Example: A 5-carat, watermelon tourmaline from Brazil would be unique and highly valuable due to its combination of red, pink, and green colors.

Chapter 10: Opal

* Discusses opal, a unique gemstone composed of silica spheres that diffract light, creating its iridescent appearance.
* Example: A 10-carat, black opal from Australia would be highly prized for its intense play of colors and unique character.