Platinum, gold and silver all spring to mind when we think of precious metals. But there are many more you might have never heard of – which you probably use in everyday items like smartphones, TVs, cars and expensive jewellery.
Iridium
Iridium is the most expensive metal on earth, and considered to be the second densest metal,
As well as the most corrosion-resistant material known, if you have a TV or smartphone you are likely to use it every day.
Its price currently sits at $4,500 (£3,359.02) per ounce and has increased in price hugely as the tech industry grows, as it is used in LED TVs and smartphones.
Iridium was discovered in 1803 and is believed to have arrived on earth via the meteor which killed the dinosaurs.
READ MORE: Man discovered more valuable rock than gold
Ruthenium
Ruthenium is a rare transition metal that was discovered by Russian-born scientist, Karl Ernst Claus, in 1844 at Kazan State University.
Ruthenium’s current price is $620 (£466) per ounce, and its mostly used in electronic devices and equipment.
A highly reflective silver in colour, it can also be used in jewellery – although this is rare.