Glyptic art—the sculpting of relief cameos and sunken intaglios into hardstones—reached its artistic zenith during Classical Antiquity and the Italian Renaissance.

1. Cameo vs. Intaglio Mechanics

• Cameo (Positive Relief): Carved into multilayered sardonyx or conch shell, where the artist cuts through an ivory top layer to reveal a contrasting dark brown or reddish background layer.
• Intaglio (Negative Engraving): Carved into carnelian, chalcedony, or bloodstone to serve as personal signet seals, creating raised wax impressions when stamping correspondence.
• Medici Patronage: Lorenzo de' Medici assembled Europe's greatest gem collection, inscribing 'LAVR.MED' onto ancient Roman gems in gold Renaissance mountings.