Unknown - portrait of a young lady with purple lace

This miniature portrait of an unknown young lady is unsigned, but is well painted, with better detail than appears in the photo.
It is framed in a typical American chased frame with a lock of her hair under the small rear glass. It probably dates from around 1830 to 1835. 1171

This is one of over a dozen American portraits in the collection, from around 1830-35, all depicting young ladies wearing a "little black dress", and thus indicating the 19C origin of the proverbial fashion item, of  a "little black dress" usually claimed as being in the 1920's.