Pierre Cartier sold the deep blue 45.52ct Hope Diamond to the high-profile American socialite Evalyn Walsh McLean which propelled the then relatively little-knownn French jeweller into the headlines. Image: Getty Images.

Pierre Cartier sold the deep blue 45.52ct Hope Diamond to the high-profile American socialite Evalyn Walsh McLean which propelled the then relatively little-knownn French jeweller into the headlines. Image: Getty Images.

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