Lofty gold prices and market volatility are pushing wealthy consumers toward jewelry, especially rare colored gemstones, as ...

Once an emerald leaves its country of origin and circulates around the world, the gem’s provenance becomes murky. Scientists have now developed a nondestructive method for determining the source of an ...

Rocks retrieved from a mine in Muzo, Colombia, show some of what makes the country the biggest producer of high-value emeralds. (Carlos Saavedra for NPR) MUZO, Colombia — Although he has helped ...