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The top ten most expensive gemstones(based on quality and same carat weight, diamond not included): 1. Unheated Burma Ruby 2. Paraiba Tourmaline 3. Alexandrite 4. Emerald 5. Unheated Burma Blue Sapphire and Padparadscha Sapphire 6. Demantoid 7. Benitoite 8. Star Ruby 9. Pink Sapphire 10. Tsavorite and Cat's Eye Chrysoberyl http://www.loosefacetedgemstones.net/gemstones.html
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