in·ta·glio | in-ˈtal-(ˌ)yō
A design carved down into a gemstone, often used for seals. Devices which made an impression in wax used to seal a letter or authenticate a document
Intaglio is also common on watch fobs, because the watch fob was originally a good place to carry a seal. Once seals fell out of use, the intaglio tended to face out to the viewer, rather than down as on a seal. Some of the most commonly found Victorian intaglios are carved in Carnelian, an orange-brown variety of quartz.