Gemstones of the World

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The book begins with descriptions of gemstone identification properties. Moh’s scale of hardness, basic mineral chemistry, specific gravity, cleavage and fracture, refraction and absorption, pleochroism, and fluorescence are described in sections followed by charts of these properties for selected gemstones. Later, these concepts are referenced and quantified in specific descriptions for each gemstone. Short, useful sections on mining, polishing, and faceting follow. Ocr tesseract 5.0.0-1-g862e Ocr_detected_lang en Ocr_detected_lang_conf 1.0000 Ocr_detected_script Latin Ocr_detected_script_conf 0.9909 Ocr_module_version 0.0.14 Ocr_parameters -l eng Old_pallet IA-NS-1200238 Openlibrary_edition

Colorful tourmaline crystals: Tourmaline was added as a birthstone for October in 1952. Tourmaline occurs in many colors, which gives people born in October many color choices for their birthstone. How Today's Birthstone List Evolved Standardization of the birthstone list in 1912 was a good thing to do. It reduced confusion between organizations and individuals who had different ideas of which birthstones should be used to represent different months. However, the list has been modified several times since 1912 - and there are still multiple "birthstone lists" in use. Fortunately, there are only a few points of departure among the many lists used in the United States and the United Kingdom. Taaffeite has only been found in Sri Lanka and Tanzania. Most material is not suitable for faceting, making it even more difficult to source. The gemstone is so scarce, it is considered over 1 million times more rare than a diamond. Access-restricted-item true Addeddate 2021-12-15 08:06:03 Autocrop_version 0.0.5_books-20210916-0.1 Boxid IA40308601 Camera Sony Alpha-A6300 (Control) Collection_set printdisabled External-identifier

The text begins with a brief mineralogical and gemological study, focusing on such topics as basic crystallography and crystal systems, hardness, refractive index, and other pertinent features of gem materials. Schumann largely focuses on minerals but does give proper descriptions of organic and synthetic materials as well. These first few sections serve as an excellent introduction to, or refresher on, many of the basic concepts that help make identification easier. The text is easily comprehensible to those at least somewhat familiar with the science of gemology, and it does a reasonably good job explaining the concepts for a novice. For someone completely new to the science, the jargon may be difficult, although Schumann attempts to bypass this issue by providing a brief list at the beginning of the book of terminology that may be unfamiliar. Ruby is the birthstone for the month of July and the world's most popular red gem. Rubies range in color from orangy-red, to red, to slightly purplish-red. The most desirable and valuable colors are pure red and slightly purplish red. Natural rubies have historically been expensive gems, but recent discoveries in Africa bring many attractive natural rubies into the market at affordable prices.

experience. You will increase your abilities, learn to save time and money, and have a great reference book that you will use again and again. Wearing and gifting birthstone jewelry is a long-standing custom in many countries. In the United States alone, consumers buy millions of dollars' worth of birthstone jewelry every month.It’s unusual to find a gemstone reference that can be used by scientists, jewelers, collectors, and laypeople, but such is this book, complete with color photos of over 2500 gemstones, both finished and in natural state. The volume is heavy for its size because it’s published on high quality glossy paper. As the author warns us, the text is small and in some cases abbreviated and condensed. This is to cram the maximum amount of information into a guidebook that’s quite portable. One interesting note about the photos is that often average specimens, rather than be-all, end-all quality gems are depicted. No space is wasted; even the inside covers show different gemstone cuts and a world map of gemstones respectively. Yet because of clever use of headers, shaded sections, illustrations, and white space, the text never seems cramped.

The first jewelry item that many children receive is often a birthstone ring, earrings, or pendant. Three-piece sets that include a birthstone ring, pendant, and pair of earrings are sold in many stores. These sets are popular birthday and graduation gifts. Some students select their birthstone as the center stone of their high school or college class ring. Although many birthstone gems are affordable, some, such as diamond, emerald, and ruby, can be expensive. Decades ago, many jewelry manufacturers began using lab-grown and imitation gems in some commercial birthstone jewelry. urn:lcp:gemstonesofworld0000schu_b3o8:epub:899cfe24-e02a-4f80-aa7a-44aeec62e69d Foldoutcount 0 Identifier gemstonesofworld0000schu_b3o8 Identifier-ark ark:/13960/s2pww0z5kr1 Invoice 1652 Isbn 0806930888 Lccn 77079503 //r83 Ocr tesseract 5.0.0-1-g862e Ocr_detected_lang en Ocr_detected_lang_conf 1.0000 Ocr_detected_script Latin Ocr_detected_script_conf 0.9757 Ocr_module_version 0.0.14 Ocr_parameters -l eng+deu Old_pallet IA14624 Openlibrary_edition The book concludes with charts of traditional astrological stones, the more recent birthstone-by-month designations, and some remarks on medicinal uses of stones (clearly not recommended by the author, but added for the curious). The book ends with a chart of gemstone listings by color.Mother's Birthstone Ring: A Mother's Ring displaying a lab-grown birthstone for each of her children. Birthstone Jewelry Popularity A growing trend in bridal jewelry is the "birthstone engagement ring". Many couples are looking for color, or are looking for a stone other than diamond. The birthstone engagement ring can be a logical, affordable, and attractive choice for these couples. Excellent: The most durable birthstones are diamond (April), ruby (July), and sapphire (September). All of these gems have hardness of 9 or 10, excellent durability, and are suitable for any use in jewelry. Imitation Birthstones: Synthetic and imitation gems are often used in birthstone jewelery. They have wonderful color and clarity that simulates the appearance of a high-quality natural gem at a much lower cost. The photo above shows examples of the man-made materials that are used. 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.

urn:lcp:gemstonesofworld0000schu_ed04:epub:9f9c4d71-0fce-4dbe-ab91-9c12969d87c4 Foldoutcount 0 Identifier gemstonesofworld0000schu_ed04 Identifier-ark ark:/13960/s2943jg8knf Invoice 1652 Isbn 9781402768293 Access-restricted-item true Addeddate 2022-01-04 10:09:10 Associated-names Shea, Daniel; Shea, Nicole, 1976- Autocrop_version 0.0.5_books-20210916-0.1 Boxid IA40315210 Camera Sony Alpha-A6300 (Control) Collection_set printdisabled External-identifier A shopper is looking for a gift for a niece and is having difficulty finding "the perfect item". The salesperson asks the birthdate of the niece. Upon learning that the niece was born in February, the salesperson shows the shopper to a nice display of amethyst jewelry. Taaffeite is a rare gemstone that most people have never heard of due in large part to how rare it is. The light violet gemstone was discovered in 1945 by Australian gemologist Richard Taaffe. Prior to his discovery, taaffeite was considered spinel. Spinel does not refract light in the same way this gemstone does. Taaffe's observation marks the first gemstone that was discovered as a faceted gemstone and not as gemstone rough. Red beryl is an extremely rare variety of beryl that has only been found in Utah and New Mexico. It was first discovered byMaynard Bixby in 1904. Despite being found in two locales, gem-quality red beryl has only been mined in Utah. Coined by some as the red emerald, this rare gem is very difficult to find due to the unique conditions required for this stone to form. Red beryl is not a variety of emerald but rather an entirely different gemstone with its own classifications.Fair to Poor: Gems rated less than good have some defecit that makes them vulnerable to breakage or abrasion. Emerald (May), opal (October), peridot (August), and zircon (December) Schumann devotes the most space, logically, to the most well-known and economically significant gemstones, such as diamond, sapphire, ruby, and emerald. Lesser-known and rare gems are not neglected, however, and he has compiled a fairly exhaustive list of gemstones, complete with color, hardness, density, refractive index, crystal system, and chemical composition. First published in English in 1976, Walter Schumann’s Gemstones of the Worldhas served as a handy reference guide to gemologists of any level. The most recent fifth edition is no exception. The birthstone can be the main stone of the ring, or multiple birthstones can be mounted beside or around the diamond. You can personalize your engagement ring to the month of your birth and in your own unique style.