Caroline Im is on a mission as unique as the precious stones displayed in the Lyda Hill Gems and Minerals Hall at the Perot Museum of Nature and Science. When Im leads tours through the glittering ...
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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