An important and wonderfully historic RIGHTS OF WOMAN intaglio seal necklace pendant with a nod to women's history and the suffrage movement.  

The often quoted historic words from the women’s suffrage movement that continue to ring true today … RIGHTS OF WOMAN
Committed to change the world, a progressive group of women believed that women deserved rights afforded only to men … the right to life, liberty, and the pursuit of happiness … and so began the woman’s rights movement.  These women and women's organizations not only worked to gain the right to vote, they also worked for economic and political equality and for social reforms. 

- approximate seal measurement - almost 5/8" x almost 3/4" (15mm x 18mm)
- intaglio thickness - 1/8" (4mm) it's a bit thick, as is the original purple glass intaglio
- intaglio seal metal - sterling silver (.925 silver)
- photographed with a US dime and an inch ruler for scale 
- the charm is shiny silver, not oxidized, and it appears differently depending on how the light hits it
- charm only, shown on a cable chain which is sold separately here
- the last photo depicts an impression of the original seal in sterling silver, available here

I've molded a Progressive era (1870-1920) intaglio glass wax seal and had it cast in sterling silver, so it is a replica of the original purple glass seal.  Then I added a suspension loop so it can be worn as a pendant. 
Please note, the original purple glass intaglio is not available for purchase.

The original purple glass intaglio wax seal was likely used back in the days of the Suffrage Movement, by suffragettes and supporters and its color purple was selected for a reason: 
In 1908 the colors purple, white and green were adopted as the colors used by the Women’s Social and Political Union in England and purple represented royalty (the royal blood that flows in the veins of every suffragette), the instinct of freedom and dignity.
In 1910 the National Woman’s Party in the United States adopted purple, white and gold to represent their movement, describing purple as the color of loyalty, constancy to purpose and unswerving steadfastness to a cause.

Impressed with history!