وادى الريان2020

gold   Gold is a precious metal because it does not change the shape easily and is a metal that is easy to form Gold is an ancient mineral known to man, where it was used in almost everything from making jewelry such as rings, crowns and bracelets. One of the most famous civilizations that used gold in everything is the ancient Egyptian civilization (Pharaonic) Gold was the upper class in society I also used gold for other uses to stimulate the work of old coins and was used as a commodity in trade. The types of gold in terms of caliber / This classification according to the ratio of gold per kilo, which is as follows: Gold carat 24: It is the finest gold and the most expensive, as the proportion of gold in it is 99%, and add another element, may be copper, or silver, or Mercury, by 1%. Gold 21 carat: the second most famous types of gold, and each kilogram of it is added 150 grams of other elements, such as: copper, or silver, that is, the prop...