• Minerals, Precious Metals and Gems

    Precious metals. Precious metals are rare, naturally occurring metallic chemical elements of high economic value. Chemically, they tend to be less reactive than most elements. They are usually ductile and have a high lustre. In history …

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  • GEMS AND GEM MINERALS OF NORTH CAROLINA*

    2007-8-29 · blue sapphire of a little over one carat, and three dark stones weighing respectively t+,I+, and f; carats each. The most noted ruby locality is on Cowee Creek, north of Franklin, Macon County. The ruby corundum at this locality oc-curs in an entirely different rock from that in which the corundum gems occurred at the Corundum Hill Mine.

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  • Ruby Gemstone: History, Uses, Properties & More

    Ruby History. Ruby stones derive their name from the Latin word ruber, which unsurprisingly means "red.". Ancient societies everywhere revered ruby as a symbol of wealth, power, and protection. Even the famous Roman scholar Pliny …

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  • The Ruby & Sapphire Deposits of Moung Klung, Siam — …

    Map showing the deposits of Thai ruby and sapphire. The province of Chantabun proper has long been known as being rich in rubies. The well known explorer Henri Mouhot, writing in 1868, says that"precious stones of good quality are found in the mountains of Chantabun; there is even at the East of the town a hill called the mountain of the ...

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  • The Top 10 Rarest Gemstones in the World | TrueFacet

    2015-3-30 · When we think of precious stones, diamonds, emeralds and rubies jump to mind as the most valuable gemstones in the world. However (or perhaps surprisingly), there are so many gemstones that are even more rare and, in turn, even more valuable. Check out these ten incredibly rare and insanely expensive gems below. 10. Tanzanite

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  • Geology of Corundum and Emerald Gem Deposits | Gems …

    2020-1-31 · The second period of corundum formation was the Pan-African orogeny (750–450 Ma). This includes primary ruby and sapphire deposits in the gemstone belt of East Africa, Madagascar, India, and Sri Lanka that are linked to collisional processes between eastern and western Gondwana (figure 2) during Pan-African tectonic-metamorphic events (Kröner, 1984).

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  • Madagascar Ruby & Sapphire • Ruby & Sapphire: A …

    2  · This excerpt from Ruby & Sapphire: A Gemologist''s Guide (2017) details the ruby and sapphire deposits of Madagascar. Since the mid-1990s, Madagascar has become one of the world''s most important sources. Madagascar Ruby & Sapphire. My first recollection of Madagascar was grade school, where we dutifully learned that a prehistoric fish, long thought …

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  • Frequent question: What family is a ruby in?

    Strictly speaking the precious stones are only seven in number—the diamond, the pearl, the ruby, the sapphire, the emerald, the oriental catseye, and the alexandrite; but to these are often added the so-called semi-precious stones—such as the amethyst, the topaz, the tourmaline, the aquamarine, the chrysoprase, the …

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  • CATHOLIC ENCYCLOPEDIA: Precious Stones in the Bible

    The precious stones of the Bible are chiefly of interest in connexion with the ... The stone belongs to the silex family (chalcedony species) and is formed by deposits of siliceous beds in hollows of rocks. To this mode of formation are due the bands of various colours which it contains. ... RUBY. — This may have been either the carbuncle or ...

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  • Rubies & Sapphires—Sparkling Reminders of God''s …

    2010-4-1 · Rubies and sapphires are varieties of the same mineral, called corundum. This hard mineral, composed of aluminum and oxygen (Al 2 O 3 ), comes in many different forms and degrees of clarity. Only the rarer, clearer crystals are classified as rubies or sapphires, based on their color. 1. Of most interest is the source of corundum''s hardness.

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  • Gem Stones of the United States

    2011-6-27 · rocks, especially granite and pegmatite deposits. INTRODUCTION Gem stones generally are divided into two categories: precious and semiprecious. A precious gem stone has beauty, durability, and rarity, whereas a semiprecious gem stone has only one or two of these qualities. The diamond, emerald, ruby, and sapphire are considered precious gems.

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  • The Precious Gemstone Diamond

    For example, a stone weighing 34 pt weighs .34 ct Larger Diamonds are worth more than proportionally smaller ones, meaning a 3 ct Diamond surpasses the value of three 1ct Diamonds. Diamonds (as well as other precious colored gemstones) are often sold together with a certification document that lists comprehensive details about the stone ...

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  • Gemstone Information

    Ruby History Ruby gets its name from the Latin word for red, ruber is one of the four precious stones along with diamond, sapphire and emerald. Ruby is the third hardest gemstone--with a Mohs rating of 9--after diamond and moissanite.

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  • GIA Gem Encyclopedia | Complete List Of Gemstones

    Gem Encyclopedia is a virtual journey through the science and lore of Gemstones from across the globe. Each Gem page features Gemological Information, a …

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  • The Geology of Rubies | Discover Magazine

    2004-11-24 · So, adding all these things together, ruby is very rare." The majority of the world''s ruby deposits (but not necessarily the best) are in a discontinuous band of marble that stretches 1,800 miles along the southern slope of the Himalayas from Tajikistan through Afghanistan, Pakistan, Kashmir, Nepal, and on into China and Vietnam.

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  • Afghanistan''s Ruby and Spinel Mines

    The Ruby mines have not been worked for the last twenty years and upwards. They were then given up in consequence of the labour spent on them not having been sufficiently rewarded; whether the mines had been exhausted, or whether …

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  • Where Are the World''s Rubies Found?

    Gemstone Information - Ruby Meaning and Properties - Fire ...

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  • Corundum Value, Price, and Jewelry Information

    Sapphires over 5 carats, clean and with good blue color, are similarly rare and also valuable. Relatively speaking, there is an abundance of good quality small sapphires but not rubies. Very few known ruby deposits can be actively worked, …

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  • Gemstones in Western Australia

    2018-5-28 · of precious stones: traditionally diamond, ruby, sapphire and emerald (and sometimes opal). Emerald occurs in small quantities and has been mined periodically since it was first discovered at Poona in 1912, and the small deposits of precious opal have been worked out. However, discoveries in the late 1970s of diamond in

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  • Myanmar Gems | Mia Ruby Trusted Myanmar Gems & …

    Myanmar rubies are the best in the world for their near perfect "pigeon''s blood" purple-red colouring, and command the highest prices. The light inclusions within the stones means that they can shine in any environment. Ruby is the birthstone of July and the 40th anniversary gemstone.

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  • ANCIENT HISTORY OF THE GEM STONE

    1997-7-28 · Images of perfection, wealth, and status also surround gemstones. Some of the most precious colored gems are ruby, emerald, and sapphire. These stones as well as numerous others, such as aquamarine, amethyst, garnet, opal, peridot, and turquoise, are found all over the world. Ruby and sapphire are gem varieties of the mineral corundum.

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  • Precious Stones

    Precious Stones - The Big Five: Part 2, The Ruby. What fairy tales of enchanted princesses and legendary lore of the Arabian Nights does not the mere mention of the ruby conjure up to our imagination! No stone has been more intimately connected with poetry and romance, and few gems can compare either in beauty or value with a perfect ruby.

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  • Top 10 the Most Expensive Precious Stones

    2019-10-29 · The limited number and huge popularity make these jewels extremely expensive. Per carat of high-quality ruby on the world market, you will have to pay about 15 thousand dollars. 3. Diamond: Now it''s time to talk about top-3 of the most expensive precious stones. And the third one, in this amazing top is diamond. Actually, rough diamond.

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  • Where Are the World''s Rubies Found?

    2020-1-31 · The second period of corundum formation was the Pan-African orogeny (750–450 Ma). This includes primary ruby and sapphire deposits in the gemstone belt of East Africa, Madagascar, India, and Sri Lanka that are linked to collisional processes between eastern and western Gondwana (figure 2) during Pan-African tectonic-metamorphic events (Kröner, 1984).

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  • Gemstone Deposits

    2008-7-15 · Gemstone deposits that are carried by rivers are called placers or alluvial deposits. Rivers can transport gem-bearing rock many hundreds of miles. When the force of the current diminishes, the denser gems, such as diamond, zircon, garnet, sapphire, chrysoberyl, topaz, peridot and tourmaline, are deposited before the lighter quartz sand.

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  • 10 Most Valuable Gemstones in The World

    2021-6-3 · Here is the Top 10 list of most expensive gemstones in the world: Tanzanite—$1,200 per carat. Black Opal —$9,500 per carat. Red Beryl—$10,000 per carat. Musgravite—$35,000 per carat. Alexandrite—$70,000 per carat. …

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  • Russian Gemstones and Minerals [List] | Gem Rock Auctions

    Anybody thinking of Russian stones is more than probably thinking of these delightfully ornamented Faberge Eggs that are so precious and hunted year after year. Moreover, Russia is also believed to be the significant source of sapphire, …

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  • Top Spots For Gem Hunting In The US

    When you think of mining for the "big four" gemstones — diamond, ruby, sapphire, and emerald — it''s easy to imagine places like India, South Africa, and Colombia.However, you can find these stones and many others at plenty of gem hunting spots in the United States.

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  • Ruby – Precious stones and jewelry Kolomatsky&Co

    2021-3-12 · Ruby is a pink-ish red to blood-red colored gemstone, a variety of corundum. Another variety of conundrum that is also popular and iconic are sapphires. But back to the ruby, it is one of the most expensive stones on the market. In terms of hardness, it is second only to diamond. Ruby is a stone…

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  • Where Do Rubies Come From?

    2016-7-2 · A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of …

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  • Ruby-Zoisite Information

    2006-10-30 · Ruby-zoisite is the natural combination of both ruby and zoisite crystals in a single specimen. It is also known as ''anyolite'', a name derived from the Masai word for ''green'' (anyoli). Other name variations include "ruby-in-zoisite" and "Tanganyika artstone" by-zoisite was discovered at the Longido mining district in northeast Tanzania by Tom Blevins, an English …

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  • How to Identify Precious Stones

    2016-9-26 · Corundum, sapphire, and ruby are found in gneiss, granite, mica slate, chlorite slate, dolomite, or granular limestone. In Ceylon precious stones are searched for in the beds of rivers, also in a gravel deposit (generally ten or twenty feet below the surface).

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