The document is signed by Christoph Köchert, whose family long served as jewelers to the imperial court.

A legendary jewel of the Hapsburg dynasty — not seen since 1919 and thought lost, stolen or recut — has actually been safe in ...

De Beers and Endiama discover a new kimberlite deposit in Angola, the first in 30 years, changing the global diamond map.

Strontium titanate’s remarkable ability to perform at extremely low temperatures makes it a key material for next-generation cryogenic devices used in quantum computing and space exploration. Supercon ...