2010年10月27日星期三

Replica Longines Istituto Idrografico R. Watches bear in mind to pay

The percentage of gold in a piece of Replica Longines Istituto Idrografico R. Watches is measured in Carats. It is used to measure the purity of Gold. A Carat was originally a unit of mass (weight) based on the Carob seed or bean which was used by ancient merchants in the Middle East. The Carat is still also used for the weight of gem stones where 1 carat = 200mg. For gold it is used to measure the purity where pure gold is 24 carats.Gold has an excellent chemical stability with a high resistance to corrosion and oxidation. However, this is just one of the many properties that gold possesses, which when considered in combination with each other have led to a number of exciting and often unique industrial applications. 24 Carat gold is like pure silver is too soft to work with and it is often mixed with other metals. The metals that are mixed with gold create different gold shades. An example is Copper, the higher the percentage of copper is in the mix, the more ;coppery; the color of the gold will be, so we have rose gold. The higher the Carat is, higher the percentage of pure gold there is in the piece. It is important to note that 24K gold is very soft, so it also follows that the higher the Carat is the softer the piece will be. 22K gold jewellery is made up of 91.3% absolute gold and 8.4% other metal. This gold alloy is softer than the rest and is known as being capable to create intricate designs. 12K gold is a combination of 12 parts gold to 12 parts other the piece only 50% gold. 10K gold is the minimum Carat that is still considered to be ‘gold in most countries. It is 10 parts pure gold and 14 parts other metals, that means that the piece of jewellery is 41.7% gold. 10K gold is often marked with 417 to indicate the percentage of gold in the piece. 18-Carat gold is 18/24ths, or three-quarters pure gold, and jewelry of this fineness is marked 18k or 750, the European designation meaning 75% gold. When shopping for gold Replica Longines Istituto Idrografico R. Watches , bear in mind to pay attention to the Carat mark. In general, the higher the Carat, the more expensive the piece will be. In the UK, 14-Carat gold, is the most common degree of fineness. 9 Carat gold, hallmark 375 is also very popular in the jewellery market in the United Kingdom. Nothing less than 10 Carats can legally be marked or sold as gold jewelry in the U.S.The article is written by Jenny Gemma, a fashion graduate who is passionate about gold Replica Longines Istituto Idrografico R. Watches .