Cut seashells depicting female profile cameo pin / pendant silver 800 stamp

Vintage cut seashells depicting female profile silver stamped 800 on back . Marcasites along the edges for that perfect sophisticated look. Described as early 20th century on one I found sold . Beautiful piece and could easily become a family heirloom. Gift it or keep it add a chain to wear as a necklace/ wear as brooch . No chain included !