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ostro stone
14 novembre 2016

Largest known intense blue topaz faceted gemstone goes on display at the Natural History Museum

Largest known intense blue topaz faceted gemstone goes on display at the Natural History Museum
The Ostro stone. An impressive 9,381 carats blue topaz, around 2 kilograms . © Trustees of the NHM, London. LONDON .- One of the world’s most colourful and flawless large gemstones, the Ostro stone, has gone on permanent show in the Natural History Museum...
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