Ammonites are extinct marine mollusks, characterized by their distinctive spiral shells. These ancient creatures thrived in Earth’s oceans for millions of years, disappearing alongside the dinosaurs approximately 66 million years ago. Widely collected, their monetary worth is not fixed, depending on diverse criteria from physical attributes to geological history.
Key Factors Determining Value
Preservation quality significantly influences an ammonite’s market value. Complete specimens, exhibiting intricate shell details and minimal damage, are highly prized. A fossil retaining its original shape, with clear suture lines or growth patterns, commands higher value than fragmented or heavily restored pieces.
Size is another important determinant; larger, well-preserved ammonites typically fetch higher prices. While many common ammonites are only a few inches in diameter, some rare specimens can exceed a meter across. The world’s largest known ammonite, Parapuzosia seppenradensis, measures nearly six feet wide.
The rarity of a specific ammonite species or its unique features impacts its worth. Some species are scarcer due to limited discovery sites or distinctive characteristics. Heteromorph ammonites, with unusual uncoiled or irregularly shaped shells, are particularly sought after by collectors.
Iridescence and coloration are significant, especially in Ammolite specimens. Ammolite is a rare, opal-like gemstone formed from fossilized ammonite shells, primarily found in Canada’s Bearpaw Formation. Ammolite value is assessed by the vibrancy and range of its colors. Specimens displaying three or more brilliant hues, such as rare blues, violets, golds, or purples, are highly desirable. High-quality Ammolite shows vivid colors across its surface and maintains brilliance when rotated, indicating a strong “rotational range” of color.
The preparation of the fossil and the surrounding rock matrix also play a role in its value. A meticulously extracted and cleaned specimen, with minimal damage from the removal process, is more appealing. If the ammonite is still embedded in an attractive or scientifically relevant rock matrix, its aesthetic and scientific appeal can be enhanced. Polished ammonites, particularly those cut in half to reveal mineralized inner chambers or crystal formations, are highly valued for their decorative qualities.
The geographic origin or locality of an ammonite influences its value due to unique preservation styles or desirable features. Canadian ammonites are noted for producing gem-quality Ammolite, making them highly prized. Other localities, such as Madagascar and England, produce ammonites with distinct characteristics, including different sizes and preservation types.
Navigating the Market: Where to Buy and Sell
Acquiring or selling ammonite fossils involves navigating a diverse marketplace. Specialized fossil dealers, both online and in physical stores, are a prominent avenue for transactions. These dealers possess expertise in paleontology, offering a curated selection of specimens and information regarding their origin and preparation.
Gem and mineral shows provide opportunities to view a wide array of ammonites directly, allowing close inspection of quality and condition. These events connect buyers and sellers within the fossil collecting community. Reputable dealers at such shows offer assurance regarding authenticity and fair pricing.
Online marketplaces and auction platforms, such as eBay, serve as active hubs for buying and selling ammonites. While offering a vast selection, they necessitate careful discernment due to varying quality and authenticity. Specialized auction houses typically deal in higher-value specimens, providing more rigorous authentication processes.
Market prices for ammonites are influenced by supply and demand dynamics, and prevailing collector trends. The availability of certain species, combined with their popularity, can cause value fluctuations. Understanding these market forces helps in making informed buying or selling decisions.
Ensuring Value: Authenticity and Appraisal
Confirming the authenticity of an ammonite fossil is important, as counterfeit or heavily restored specimens exist. Red flags for altered or fake ammonites include unnaturally vibrant colors, excessive glue, or multiple glued pieces. Close examination for unnatural chisel marks or a lack of natural shell texture can also indicate manipulation.
Knowing the provenance—the detailed history of a specimen’s origin and ownership—adds to its credibility and value. Reputable sellers typically provide information about where and when a fossil was found. This documentation helps establish genuineness and reassures potential buyers about ethical acquisition.
For higher-value ammonites, seeking a professional appraisal is a prudent step. Experts such as paleontologists, established fossil dealers, or certified appraisers provide informed valuations based on scientific criteria and market trends. Appraisal services evaluate both the paleontological significance of the specimen and, if applicable, its gemological qualities, such as Ammolite presence and quality.