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 ...
Have you ever seen an over 9,000 carat gemstone in person before? It's certainly not something you can wear on your finger but it is something you see for the first time at the Perot Museum of Nature ...
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 ...
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.
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