Seed Pearl Necklace and Bracelets

[Steve]

I posted the image of Miss Dart because I thought this photograph had one of the best matches to the woman clothes-wise and hair-wise; along with it having a definite date of 1856. I did use other photographs to date the daguerreotype's image, this one had the most elements in common along with an inscription with the date.

If the physical elements of the daguerreotype (ie mat, preserver, etc) tend to date it prior to 1859 and the clothing of the couple and the hair style of the lady are of mid-to-late 1850's style, why date it to 1861?