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Blue topaz gemstone, largest of its kind, to go in display in UK

  • Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    1/5

    Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London

    Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    Reuters
  • Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    2/5

    Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London

    Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    Reuters
  • The Ostro stone, 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
    3/5

    The Ostro stone, the largest known blue topaz stone, owned by philanthropist Maurice Ostro, is displayed to media at the Natural History Museum in London

    The Ostro stone, 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
    Reuters
  • Philanthropist Maurice Ostro is reflected in his Ostro stone, the largest known blue topaz stone, as he holds it for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    4/5

    Philanthropist Maurice Ostro is reflected in his Ostro stone, the largest known blue topaz stone, as he holds it for media at the Natural History Museum in London

    Philanthropist Maurice Ostro is reflected in his Ostro stone, the largest known blue topaz stone, as he holds it for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
    Reuters
  • 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
    5/5

    The largest known blue topaz stone, owned by philanthropist Maurice Ostro, is displayed to media at the Natural History Museum in London

    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
    Reuters
Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
Philanthropist Maurice Ostro looks through his Ostro stone, the largest known blue topaz stone, for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
The Ostro stone, 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
Philanthropist Maurice Ostro is reflected in his Ostro stone, the largest known blue topaz stone, as he holds it for media at the Natural History Museum in London, Britain September 27, 2016. REUTERS/Peter Nicholls
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
Reuters

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 be exhibited from Oct. 19, on permanent loan from British entrepreneur and philanthropist Maurice Ostro, the museum said. Its value was not disclosed. "The original rough material that the gemstone was cut from was discovered three decades ago by British explorer Max Ostro in Minas Gerais, Brazil," it said in a statement. "The Ostro stone is the largest cut topaz to go on show at the museum...It is an impressive 9,381 carats and will be displayed alongside specimens from one of the world's most important mineral collections." (Writing by Marie-Louise Gumuchian; Editing by Mark Trevelyan)