Natural Gemstones

Natural Gemstones

Natural GemstonesA natural gemstone is a mineral, stone, or organic matter that can be cut and polished...
Dhs. 23.00 AED
Dhs. 46.01 AED
Dhs. 23.00 AED
SKU: gb-47999-ebook
Product Type: Books
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Author: Geological Survey (U.S.)
Format: eBook
Language: English
Subtotal: Dhs. 23.00
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Natural Gemstones

Natural Gemstones

Dhs. 46.01 Dhs. 23.00

Natural Gemstones

Dhs. 46.01 Dhs. 23.00
Author: Geological Survey (U.S.)
Format: eBook
Language: English

Natural Gemstones

A natural gemstone is a mineral, stone, or organic matter that can be cut and polished or otherwise treated for use as jewelry or other ornament. A precious gemstone has beauty, durability, and rarity, whereas a semiprecious gemstone has only one or two of these qualities. A gem is a gemstone that has been cut and polished. The average grade of the richest diamond kimberlite pipes in Africa is about 1 part diamond in 40 million parts ore. Kimberlite, a plutonic igneous rock, ascends from a depth of at least 100 kilometers (60 miles) to form a diatreme (narrow cone-shaped rock body or pipe). Moreover, because much diamond is not of gem quality, the average stone in an engagement ring is the product of the removal and processing of 200 to 400 million times its volume of rock. Each environment tends to have a characteristic suite of gem materials, but many kinds of gems occur in more than one environment. Most gemstones are found in igneous rocks and alluvial gravels, but sedimentary and metamorphic rocks may also contain gem materials. ......Buy Now (To Read More)

Product details

Ebook Number: 47999
Author: Geological Survey (U.S.)
Release Date: Jan 16, 2015
Format: eBook
Language: English

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