here are the 35 most valuable gemstones in the world, ranked by their price per carat weight. And, yes, this list does include diamonds, emeralds, rubies and sapphires. Price per carat:$51-$108.08 ...

A rare square 37-carat emerald owned by the Aga Khan fetched nearly nine million dollars at auction in Geneva on Tuesday, making it the world's most expensive green stone, AFP reported.

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It’s not too late to make that last-minute holiday purchase… Lugano Snake ring set in 18-karat white gold and ebony with diamonds and a 3.5-carat shield-cut emerald. Price upon request.

With all else equal, emeralds are generally the most affordable of the three, ranging from about $500 to $1,000 per carat. A sapphire ... However, while the price of gold has seemingly plateaued ...