Red Diamond – $5 Billion/Kg

Everyone wants a diamond ring for their engagement, and it’s always about carats and flaws. However, some people choose to go the extra mile and look for a red diamond, one of the rarest stones on the planet.

Owning a kilogram of this beauty will set you back $5 billion. Still, despite having several billionaires roaming around, we doubt any of them are wild enough to get a kilogram of the red diamond. A few carats should suffice to act as a conversation starter and double as a statement piece for those wealthy enough to afford one.