This is an image of the Boucheron sapphire necklace worn by of Louise Hungerford Mackay (Marie Louise Antoinette Hungerford (SH202a)) in this full length image of her.
The caption accompanying this image reads:
Mrs. John William Mackay's breathtaking Boucheron sapphire necklace, worn in the photograph above
See Harbor Hill, Clarence Hungerford Mackay's Mansion.
