Gold is a simple form of chemical element gold (chemical element symbol Au), which is a soft, golden yellow and corrosion-resistant precious metal. Gold is one of the rarest, most precious and most valuable metals. Generally speaking, the gold in the world is in ounces. In ancient China, gold was measured in ounces, which was a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication and aerospace industry.

After the international gold price entered 20 15, it soared all the way. The gold price in new york market rose from $0/200 per ounce to $0/300 per ounce in less than a month. Statistics show that the gold futures price in new york market has increased by 9.3% this year.

Silver is a chemical element with chemical symbol Ag (from Latin Argentum) and atomic number 47. It is a silver-white transition metal. A small amount of silver exists in nature in the form of free elemental substance, mainly in ores containing silver compounds. Silver has stable chemical properties, low activity, high price, good thermal and electrical conductivity, is not easy to be corroded by chemicals, and is soft and malleable. Its reflectivity is extremely high, reaching over 99%.