Top 8 Most Expensive Gemstones

No. 5: Grandidierite

most expensive gemstones

Price tag: $100,000 per carat

This gemstone takes its name from the person who discovered it – natural historian Alfred Grandidier. The rare stone, originating from Sri Lanka, transmits a blue, white, and green light and is one of the rarest in the world. Which helps explain its price tag.