* "Pigeon blood" ruby by Cartier nets record $30.42 million * Pink diamond belonged to niece of Emperor Napoleon I * Coloured diamonds and natural pearls fetch strong prices By Stephanie Nebehay ...
GENEVA, May 12 (Reuters) - A Burmese ruby weighing 25.59 carats sold for a world record 28.25 million Swiss francs ($30.42 million) at Tuesday's auction that saw strong demand for coloured stones and ...
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