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.

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.

If you've got a big budget for your anniversary gift, this heirloom-quality ring from Mejuri is perfect. It's made with genuine London blue topaz stone and set in a textured 14K solid gold band.

Besides yellow, the stone comes in a range of hues, including blue, pink, violet, brown and orange. Topaz is primarily mined in Brazil and northwestern Pakistan, the Geological Institute of ...

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 ...