This is a RARE CAMEO MADE IN THE CAVES OF FRANCE.IT is done in the drips of a boy and girl on swing.This cameo is after the Pierre-Auguste Cot painting, Springtime. The setting is silver not marked but tested.The size is 1 by 1 1/4 .Has a halmark on the bottom of the bezel.From around 1880.I have had one like this before.They are very rare Basically, a matrix (mold) was carved intaglio to give the proper shape or form to material introduced into it. The matrices were made from papier mache-and were placed upon short posts in places where water was dripping from the ceiling.
After a number of years, they were filled with the lime and minerals in the water, and at long last, the cameo were formed. A finishing touch-up to the carving was done to reach their final beauty, producing a genuine Antique cameo of priceless value.