Victorian brooches. Referred to as essex crystal, they are mounted in gold or silver with crystal faces and reversed intaglio designs that were then painted. Mostly of animals.

Lily of the valley pendant.
Lily of the valley pendant. 1858. Back is engraved “28th June 1858.” Image © 2020 Victoria Sterling Antique Jewelry. Fair use license. via https://www.victoriasterlingjewelry.com/products/victorian-essex-crystal-pendant-lily-of-the-valley
Duck pin.
Duck pin. Yellow gold with a painted duck standing on the shore looking out at the water. Late Victorian. Image © Fourtane, Carmel-by-the-Sea. Fair use license. via https://www.fourtane.com/product/late-victorian-essex-crystal-duck-pin/
Ladybug brooch. Victorian.
Ladybug brooch. Victorian. Image © 2015-2019 Kaleidoscope effect, Fair use license. via https://nasvete.com/insect-jewellery-symbolism/victorian-brooch-gold-essex-crystal/