4. Pink Diamonds
Price per CD: $2,054,616
We are starting the diamond series on our list of most expensive gemstones in the world. Diamonds are very rare gemstones, and colored diamonds are especially rare. The color of colored diamonds comes from impurities, or inclusions of other elements. Regarding pink diamonds, it is still not clear whether there is an element that causes this coloration, or very high pressures that impact the internal structure of diamond. Although pink diamonds are not the most expensive in $ per karats, one specimen was sold as the most expensive diamond ever.
Pixabay/Public Domain
