Who gives a second glance to the pens that are used and then thrown away on a regular basis? Well, if you had one of these pens, you would give more than just a second glance and probably store it along with your valuables for years on end. The reason? These are billed to be the most expensive pens in the entire world. Decorated with diamonds, gold, silver and what not, these pens also boast unique designs and equally unique re-filling systems. So if you are on the lookout for such a pen, here is the complete list of the most expensive pens in the world for you to choose from.