Aga Khan emerald, world's most expensive green stone, fetches record $9 million at auction
A rare square 37-carat emerald owned by the Aga Khan fetched nearly $9 million at auction in Geneva on Tuesday, making it the ...
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35 Most Valuable Gemstones, From Least to Most Expensive
When you think of expensive gemstones, what comes to mind? Most people think of the Big Four: diamonds, emeralds, rubies and sapphires. However, it might surprise you to know that there are ...
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Why the official Olympic curling stones are so expensive
A single curling stone certified for the Olympics costs over $600. That makes a full set of 16 stones worth $9,600. Since 2006, every stone used in the Olympic Winter Games has come from Kays of ...
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Aga Khan's 37-carat emerald fetches nearly $9m
A rare square 37-carat emerald owned by the Aga Khan fetched nearly nine million dollars at auction in Geneva on Tuesday, ...
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11 of the Most Dangerous and Expensive Mining Expeditions in the World
In Uruguay, Renato sets off an explosive to reveal an ancient, glittery stone: amethyst. In Italy, Enrico cuts slabs off of one of the most expensive marbles in the world: Calacatta. Stones ...