Lamp - Gilt bronze

The object in the image is an antique lamp (or lamp base) made of onyx and gilded bronze (ormolu), typical of the Rococo or Louis XVI style.
Here are the main details based on similar objects:
Materials: It features a central shaft and a square veined onyx base, enriched with finely chased gilt-bronze decorative elements.
Style: The scrolls and floral motifs on the upper part indicate a Rococo Revival or Napoleon III aesthetic, dating to the late 19th or early 20th century.
Function: Many of these pieces began as oil or kerosene lamps and were subsequently electrified, or as parts of refined fireplace sets that also included clocks and coordinated candelabra.