Top 10 Rarest Gemstones

10. Jeremejevite Cost approximation: $2000/Carat 9. Black Opal Cost approximation: $2,355/Carat 8. Red Beryl Emerald Cost approximation: $10, 7. Musgravite Cost approximation: $35,000/Carat 6. Grandidierite Cost approximation: $50,000/.5 Carat 5. Painite Cost approximation: $50-60,000/Carat 4. Blue garnet Cost approximation: $1.5 Million/Carat 3. Serendibite Cost approximation: $ Million/Carat 2. Red Diam