Cassis Tuberosa Value Guide

The Cassis Tuberosa, commonly known as the King Helmet shell, is a highly sought-after specimen for malacologists due to its impressive size and distinct triangular dorsal shape. Beyond its natural beauty, this species gained historical significance as a primary material for fine Italian cameo carving during the 18th and 19th centuries.

What Is Cassis Tuberosa Worth?

The typical price range for Cassis Tuberosa is $35 - $40 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• Overall size and weight of the calcium carbonate structure.
• The preservation of the intricate brown zigzag color patterns and lack of sun bleaching.
• Condition of the delicate spire and the absence of chips on the outer lip.
• Historical provenance or quality of the natural polish on the shell's surface.

How to Identify Cassis Tuberosa?

• Look for the characteristic brown zigzag patterns across the exterior surface.
• Identify the heavy, triangular dorsal shape which distinguishes it from other helmet shells.
• Examine the thick, polished aperture and outer lip typical of the Cassis genus.
• Verify the Western Atlantic origin and large predatory snail morphology.

History of Cassis Tuberosa

Historically, the King Helmet shell has been a prized specimen for malacologists and collectors. Beyond its beauty, this species was one of the primary materials used in the 18th and 19th centuries for carving fine Italian cameos due to its distinct color layers. In nature, these snails are nocturnal predators that hunt sea urchins on the ocean floor.