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 ...

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The largest known blue topaz stone, owned by philanthropist Maurice Ostro, is displayed to media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls LONDON - A ...