This is an image of Clarence Mackay (US1797) and his second wife, Anna Case (US1797spouse2).
Anna Case was a lyric soprano who sang with the Metropolitan Opera and as a concert soloist. Encountering her at musical events from time to time, taken with her beauty and the quality of her voice, around 1916, Mackay engaged her to perform at a musical he held at home. She so pleased him, that he had sent a railroad carload load of flowers to her at her next Carnegie Hall recital, enclosing a small diamond band with an enamel bluebird in the center, emblematic of the happiness he felt in her company.
See Harbor Hill, Clarence Hungerford Mackay's Mansion.