Blue topaz, which is often found in jewelry ... light and human color perception also play crucial roles. When light enters a gemstone, it can be absorbed, transmitted, or reflected.

Mt Surprise is recognised as producing clear or light blue topaz. Mrs Wallace said that the gems have been missing for 10 days and were stolen at night during renovations at the museum which were ...

For centuries, the primary source of topaz has been the renowned Minas Gerais region of Brazil. The rich, golden yellow, warm orange, and pinkish and reddish orange shades are said to have been ...

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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 will ...

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 ...

The largest known topaz stone, is held for photographing before it is made available to view at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls ...