Letter From Topaz Hunting at the End of the World For decades, Hill Country ranches let “rock hounds” come and hunt for rare Texas blue topaz. Now access is closed—unless you know a secret spot.

LONDON (Reuters) - A flawless blue topaz gemstone, said to be the largest of its kind, is set to go on display at London's Natural History Museum. The Ostro stone weighs around 2 kg (4.4 lb) and ...

Smithsonian Institution Usually, gem-quality aquamarine crystals (the blue variety of mineral beryl) like this come from Brazil. But this specimen didn’t travel nearly as far to get to the museum.