Top 8 Most Expensive Gemstones

No. 2: Red Diamonds

Blue Garnet

Price tag: $2 – 2.5 million per carat

When Miss Monroe said that diamonds are a girl’s best friend, she should have said red diamonds. These gemstones are the most expensive variety of diamonds out there and, up till now, they have only been found in an Australian mine. The interesting thing is that most gems are not actually red, but a deep purplish color.