WHICH ARE VARIOUS GEMS DEPOSITS ON EARTH?


Diamond mines produce both gem-quality and industrial diamonds. Although most of the diamonds sold are industrial diamonds, the value of the gem diamond trade is much greater. Africa is the richest continent for diamond mining, accounting for around 49 per cent of world production. Artificial diamonds are made for use in industry. Most artificial diamonds are made in the United States.



A total of only 314 tonnes of diamond has ever been mined in the whole history of diamond mining. The world’s total of all gems, industrial, natural and synthetic is around 57 tonnes per year.



The world’s famous diamonds



The Star of Africa is the world’s largest cut diamond. It was cut from the biggest diamond ever found and is included in the British Crown Jewels. The Smithsonian pink diamond, although small, is extremely valuable because of its unusual colour.




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HOW DO WE WEIGHT AND CHECK THE HARDNESS OF GEMSTONES?


Weighing gemstones



Diamonds and other gemstones are weighed in a special unit. This is called a ‘carat’. There are five carats (cts) in one gramme. Therefore 1 kg is 5,000 cts. Tiny diamonds have their own measure. They are weighed in ‘points’. One carat is 100 points, so a quarter-carat gem (0.25 ct) is a ‘twenty-five pointer’. Gold is also measure in carats but these are not based on weight. They are amounts of gold in metal, and 24 carats is equivalent to 100 per cent pure gold.



Testing for hardness



By comparing other stones with the hardness of a diamond, a test called the ‘hardness test’ was developed. Minerals can be tested by measuring their hardness. In the diagram, the hardness value of several different substances is given. This is called the Mohs scale and measures hardness from one, representing talc, to ten — diamond — with the highest hardness value.



Calcite is a colourless mineral found in limestone; gypsum is a white mineral and is used for making plaster.



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DO GEMSTONES PLAY ANY ROLE IN ENVIRONMENT CONVERSATION?


Gemstones play an important part in our lives. We use gems in medicine, space travel, weather forecasting, and engineering in industry. Without them we would not be able to drill into the Earth’s crust to extract oil, which has numerous uses in today’s world. However, the extraction of gemstones can cause a number of environmental problems.



Wildlife



During the mining process, large areas of vegetation are cleared to allow for the exploration of the area, the actual mining and the processing of the gemstones retrieved from the mine. As a result, the animals and plants in the area are wiped out.



Pollution



The heavy digging and lifting machines used in the mining industry pump out carbon monoxide, hydrogen and oxides of nitrogen and sulphur. These can be harmful to humans and wildlife. The carbon monoxide is converted into carbon dioxide in the atmosphere. This contributes to the greenhouse effect — global warming — which could devastate our planet if it is not controlled.



Waste



Usually, a lump of rock bigger than a house must be crushed and sorted to find one small gem. This waste must be disposed of safely so that it does not cause further damage to wildlife. The crushing of waste rock also produces a lot of dust, which can hang in the air, making breathing uncomfortable. Water drainage from mining processes carries acidic waste products into rivers, causing harm to the local ecosystem.



Rarity



Many gems are rare. Even gems that are thought of as common, such as amethyst, are rare compared to most rocks in the Earth’s crust. To conserve these rare stones, scientists have found ways of creating artificial gemstones, mainly for use in industry.



The future



To protect the environment from damage caused by gemstone mining, it must be managed properly. This means that governments and mining companies must stick to rules that encourage waste to be disposed of safely. They must also limit destruction of ecologically important areas, such as habitats that contain endangered species of plant or animal life.





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HOW GEMS ARE USED IN SPACE SCIENCES AND IN THE FIELD OF MEDICINE?


 



Gems have played an important part in medicine since around the 1960s. Rubies are used to produce a laser beam in certain types of lasers. Ruby lasers are used in the removal of skin blemishes, such as tattoos. However, there can be side-effects to this treatment, such as scarring and a removal of natural skin colour in the area.



Diamond has many special properties. Hard diamond chips are used on dental drills to allow them to cut easily through teeth. Many kinds of radiation can travel easily through diamond and it can withstand huge pressures. This makes it suitable for use in space, and in weather and spy satellites. Perfect diamonds are used on space probes, as they are unlikely to be damaged by the deadly gases found on some planets, such as Venus.




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WHY QUARTZ IS USED IN PRECISION INSTRUMENTS?


Quartz is often used in precision instruments. Scientists discovered that when quartz crystals are put in an electric field, they will vibrate. The precise way in which the quartz is cut affects the speed at which it vibrates. This exact vibration is used as the beat to keep time in a ‘quartz’ clock or watch. Tiny ‘jewel’ bearings, often rubies, are fitted inside clockwork watches. They are used because their surfaces are not worn away by the workings of the watch.



High-quality natural diamonds are used to make fine scalpel blades for surgeons to use in delicate eye operations. The precision-made stylus in a record player pick-up is also a diamond and therefore lasts for a long time. Heat flows through diamond very easily, so tiny diamond pieces are used in television transmitters to keep electronic devices cool.



A quartz watch



In a quartz watch, a battery produces electric pulses. These electric pulses ‘wobble’ the quartz. As long as the battery continues to do this, the quartz will ‘wobble’ at an exact rate to create a steady pulse. This helps to keep the watch showing the correct time.



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