This is a vintage Murano glass ashtray, likely from the mid-20th century, specifically the 1950s-1970s.

Origin:

This type of ashtray is handcrafted on the island of Murano in the Venetian Lagoon, Italy.

Design:

It features a ruffled or shell-like shape with a green color that fades from dark at the edges to lighter in the center, and incorporates a controlled bubble design.

Technique:

Murano glass ashtrays are typically made using glassblowing and are slowly cooled in a "tempera" oven for strength.

Collectible Value:

These pieces are often considered more like glass sculptures than utilitarian objects due to their artistry and are sought after by collectors and interior designers.