1 Gems Formed – Gems stone
Pink Color Tourmaline Specimen

Pink Color Tourmaline Specimen

Aquamarine Specimen,Crystal Tourmaline,Green Color Tormaline More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen,Crystal Tourmaline, More »

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

watermelon Tourmaline

watermelon Tourmaline

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

 

Category Archives: Gems Formed

Where Gemstone are Found

WHERE GEMSTONES ARE FOUND

Some gem minerals such as quartz and garnet are found worldwide others like diamonds and emeralds are rarer due to the more unusual geological condition necessary for their formatio

n even when a mineral is found worldwide only a minute proportion may be of gem quality the main gem localities of the world are therefore those where gem quality material occurs in sufficient quantity to make production economic.
DIAMONDS OF AFRICA and Asia
The kimberlite rocks of southern Africa are mined in a modern large scale way producing vast quantities of diamonds for both industrial and gem use .
TWELVE KEY GEMS
The 12 varieties of gemstone shown on this map represent some of the worlds best known but some are far rarer than others .All are popular and higly prized .
PEARLS IN JAPAN
The shallow coastal waters of the Japanese islands offer ideal conditions for farming pearl oysters pearls are organic gems and therefore independent of geological condition .
WORLD DISTRIBUTION
This map shows the main localities for 12 key gems each gem may of course occur in other places but probably not in sufficient quantities to make its ex traction economic some site although historically impotrtant may now be work out.
RUBIES IN BURMA
The rich mineral deposits of mogok in Burma have yield some of the world finest rubies although extraction is by traditional methods sapphires are also mined here .

How Gemstone are Formed

HOW GEMSTONES ARE FORMED
Gemstones that have a mineral origin are found in rocks ,or in gem gravels derived from these rocks .Rocks themselves are made up of one or more minerals and may be divided into three main types .The formation of these three types igneous ,sedimentary ,or metamorphic –Is a continuous process ,best described in term of the rock cycle .Gem-quality minerals with in these rocks may be easily accessible at the earth’s surface,or lie buried deep beneath it .others ,separated from their host rock by erosion ,are carried by rivers to lacks are the sea
METAMORPHIC ROCKS
Metamorphic rocks are either igneous oe sedimentary rocks that have been changed by heat and pressure within the earth to form new rocks with new minerals .As this happens, gemstones can grow within them .Garnets,for example ,form in rock called mica schists ,which were once mudstones that has been subjected to intense pressure and high temperatures, mzy contain rubies
IGENOUS ROCKS
Igenous rocks have solidified from molten rock,which comes from deep beneath the earth’s surface .some ,called “extrusive” igneous rocks ,are thrown out from volcanoes as lava ,volcanic bombs, or ash.”Intrusive “igneous rocks are those that solidify beneath the surface .Essentially ,the slower a rock cools and solidifies, the larger the crystals –and therefore the gemstones-crystals –and therefore the gemstones crystals form in a kind intrusive igneous rock known as pegmatite .
SEDIMENTARY
Sedimentary rocks are formed by the accumulation of rock fragments produced by weathering .In time, these fragments settle down and harden intio rock once more. Sedimentary rocks ;turquoise occurs mainly as veins in sedimentary rocks such as shale;halite and gypsum are sedimentary rocks .
ORGANIC GEMS
Organic gems come from plants and animals . Natural pearls form around foregin bodies that have made their way inside the shells of marine or fresh water shellfish .cultured pearls are produced artificially in large fisheries ,many in the shallow waters off the shores of Japan and China.Shells treated as gems may come from animals as biverse as snails and turtles,living in the ocean, in fresh water,or on land .Coral is made up of the skeletons of thiny marine animals called coral polyps. Bone , or ivory from the teeth or tusks of mammels ,may come from resently living animals or from fossils thousends of years old.Amber is fossilized tree resin,collected from soft sediments or the sea. Jet is fossilized wood .Found in some sedimentary rocks .
TREASURE FROM THE SEA
The action of sea water as given this piece of amber ( fossilized tree resin ). Washed up on a beach in Norfolk ,England ,a pitted and worn surface .

MODERN DIAMOND MINE IN BOTSWANA
Some gemstones are so valuable that large –scale mining ,in which tonnes of rocks may be extracted to collect thiny amount of gemstones ,are still viable .
ALLUVIAL MINING FOR SAPPHIRES
Small –scale mining with traditional method and equipment ,such as this in sierraleone ,is still common in many under –developed countries .