Natural blue topaz, by contrast ... We pull off a dirt road and hop out near a few large holes in the ground. Roberts grabs shovels, chisels, and a big orange bucket, and we start searching.

The royal also chose to wear the large Kiki McDonough Blue Topaz and Diamond Drop Earrings again. While Kate has worn the earrings a further six times, she hasn’t been seen wearing the necklace ...

A flawless blue topaz gemstone - the largest of its kind - will be displayed in the Museum's Minerals gallery from 19 October. The Ostro stone is the largest cut topaz to go on show at the Museum.

THE WORLD'S biggest chunk of cut blue topaz gemstone has been unveiled 30 years after it was discovered by a swashbuckling British adventurer likened to Indiana Jones. Max Ostro escaped death at ...

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 ...