Rare Intaglio in Lava Stone (Volcanic Basalt) – Portrait of Napoleon I, Emperor, in Style - Cylinder seal

Exceptional and rare intaglio (seal matrix or small plaque for a dactyliotheca) from the first half of the 19th century, made in real lava stone (basaltic magma) dark gray/black and matte. The work depicts, in negative, the idealized profile of Napoleon Bonaparte crowned with laurel, based on the famous official iconography created by the engraver Jean-Bertrand Andrieu. An exceptional historical-technical document of the hot-working of lava during the Grand Tour period.

Detailed Description

• Subject: Left-facing profile of Napoleon I Bonaparte as Emperor of the French. The face bears the bold, idealized features typical of classical numismatic models, encircled by a laurel crown whose ribbons (lemniscates) intertwine at the nape. The iconography faithfully reproduces the obverse of the official medal for the 1804 Coronation designed by Jean-Bertrand Andrieu.
• Material and Technique: Authentic natural lava stone (magmatic basalt), cold to the touch and with an opaque anthracite color. The intaglio was achieved using the complex nineteenth-century technique of hot stamping: incandescent lava, gathered in a molten state directly from Vesuvian or Etna lava flows, was pressed inside a metal matrix.
• Technical and Manufacturing Details:
• The reverse of the object is intentionally raw, unfinished, and cold-worked, bearing the typical marks of manual detachment and chipping of the volcanic stone while it was still viscous.
• Along the lower edge are visible fascinating traces of a very light, powdery material: this is the ancient detaching agent (ash or fine gypsum powder) originally used in the workshop to prevent the molten lava from permanently fusing to the cast iron mold.
• Historical Context and Dating: First half of the 19th century (circa 1805–1830). The work sits perfectly within the Neoclassical artistic climate (Empire Style) and represents a sought-after desk item or an element destined for a dactyliotheca for educated European travelers of the Grand Tour.

Curiosities about Use in the Era

• Wax seal matrix: In the 19th century, an intaglio with the imperial profile of Napoleon was set into elegant handles made of fine wood, bone, or metal to become a personal desk seal. Pressed into hot sealing wax to close letters and private documents, it left the positive impression of the sovereign’s face, testifying to the owner’s political loyalty or admiration for the Napoleon myth.
• Object for the Dactiliotheca and the Grand Tour: Given its small size (3 cm) and thin thickness, this small plaque was designed to be displayed inside dactiliothecae, refined wooden book-like cases with velvet-lined drawers. Educated Grand Tour travelers bought these stone and sulfur molds in Naples or Catania as “pocket museums” to display in European parlors the history of engraving and the medals of the greatest historical figures.
• Workshop tool for electroplating: As a technical piece left with a rough back and gypsum residues on the edge, it is possible that it was used inside a medal-making workshop or a jewelry workshop to create deformities or as an intermediate model for early nineteenth-century experiments in electrochemical metal duplication.

Characteristics and Technical Specifications

• Era: First half of the 19th century (1800s)
• Style: Neoclassical / Empire Style
• Material: Lava stone / Basaltic volcanic rock
• Diameter: 3.0 cm (30 mm)
• Weight: 7.63 g
• Condition: Excellent, consistent with the period. Retains a splendid workshop patina and sharply readable intaglio details. No restoration. Presence of residues of the original detaching agent on the edge.