The Goldsmiths' Company's summer exhibition this year explores the history of the most coveted of metals---gold.Some say that gold was the first metal to be worked by man, due to its unique natural properties. Gold is the most malleable of all metals, making it easily worked, and just one gram of gold can be hammered into a one square metre sheet. Gold is also extremely heavy, which makes it easy to collect. Much gold is found in alluvial sources, and because it is heavier than any other particles in the river, it can be separated from other minerals and debris. It is said that the ancients used sheep fleeces to filter rivers with gold deposits, into which the heavy gold pieces would become embeddedperhaps resulting in the Ancient Greek myth of the Golden Fleece.Unlike most other metals, gold is also non-corrosive, not to mention exceptionally beautiful, and thus it is no surprise that it has been coveted since ancient times. The oldest known gold articles were found in Bulgaria, however the ancient Egyptians are perhaps best known for the finest ancient gold jewellery. The Egyptians sourced their gold from Nubia, an area in the southernmost part of modern day Egypt. Nubian gold was made into some of the most famous ancient gold artefacts known today, including the treasure of King Tutankhamen.Gold is never found in its pure form, but instead mixed with other metalsknown as an alloy most often silver and copper. Pure gold, from which all impurities have been removed, is known as twenty four carat gold. The measure of fineness of gold expressed as a percentage of pure gold to other added metals, this being the benchmark for purity. Eighteen carat gold, for example, is eighteen parts pure gold and six parts other alloy metals.The colour of gold, which is naturally yellow, can be altered depending on the type and amounts of alloy metals added. In addition to yellow, other colours of gold are white gold, green gold, and red (or rose) gold. The further benefit of such alloys is that they increase the hardness of gold, which is naturally quite soft, making it more durable and, in turn, more suitable for jewellery.Gold work is often marked with a hallmarka small stamp which indicates its purity, often in addition to the stamp indicating the maker, or maker's mark. This system has been in place since the middle ages. The Goldsmiths' Company is the body in England that regulates hallmarking, which has been in operation since 1300.'Gold: Power and Allure' runs from the first of June to the twenty eight of July at Goldsmiths' Hall in the City of London. For more information follow the link:http://www.thegoldsmiths.co.uk/exhibitions-promotions/