~ ღ Skuwandi ~ World's Most Expensive Pen. Aurora Diamante Fountain Pen. This top luxurious pen costs $1,470,600. This pen is the most expensive writing instrument till date and only one is for sale per year. The Aurora Diamante contains over 30 carats of De Beers diamonds on a solid platinum barrel. It has a two-tone, rhodium-treated, 18K solid gold nib and is personalized with a coat of arms, signature or portrait.