Link to the Image Source
Metropolitan Museum of Art

Artwork Details 

Title: Portrait of a Lady
Dated: 1910–15
Medium: Watercolor on ivory in gold-colored metal foliate locket
Dimensions: Sight: 2 5/16 x 1 15/16 in. (5.9 x 4.9 cm)
Location: Metropolitan Museum of Art
City, State: New York, NY