1. Gold, Aluminium and their Alloys By Duncan & Jamie

2. Gold Gold easily creates alloys with many other metals. These alloys can be produced to improve the hardness and other properties, to control melting point or to create exotic colours.

3. Gold Alloys Coloured gold alloys are just as "real" as their golden coloured counterparts. Pure gold is generally too soft to be used for jewelry, so other metals are nearly always added to it, no matter which colour of gold is being prepped for jewellery making. Chances are the ring is marked 18K, 14K, or 10K to indicate how much pure gold is present in the mix. The K stands for karat, the system used to state how much pure gold is found in an item.

4. Gold Karat Markings 24K gold is pure gold. 18K gold contains 18 parts gold and 6 parts of another metal(s), making it 75% gold. 14K gold contains 14 parts gold and 10 parts of another metal(s), making it 58.3% gold. 12K gold contains 12 parts gold and 12 parts of another metal(s), making it 50% gold. 10K gold contains 10 parts gold and 14 parts another metal(s), making it 41.7% gold. 10K gold is the minimum karat designation that can still be called gold in the US. Even 18K gold, with its 6 parts of another metal, gives jewelers the opportunity to play around with color.

5. Gold Alloys uses Gold alloys are used for fillings, crowns, bridges and orthodontic appliances.

6. Aluminium Aluminium can be added to alloys as well. For example the addition of scandium to aluminium stops the growth that occurs when aluminium is welded.

7. Uses Some items of sports equipment, which rely on high performance materials, have been made with scandium-aluminium alloys, including baseball bats, lacrosse sticks, as well as bicycle frames and components. U.S. gun maker Smith & Wesson produces revolvers with frames composed of scandium alloy and cylinders of titanium.