Ammolite displays a vibrant iridescence, resulting from the diffraction of light through its layered aragonite structure. This unique optical phenomenon creates a play of color reminiscent of opal, with hues ranging across the spectrum, often showcasing dominant red and green flashes. The quality of this iridescence is influenced by the thickness and integrity of these layers, with thicker, more uniform layers producing more vivid colors. A single specimen can exhibit a stunning range of colors depending on the viewing angle.
Prized for its rarity and beauty, this organic gemstone has captured attention for its decorative applications, particularly in jewelry. Formed from the fossilized shells of ammonites, primarily those of the species Placenticeras meeki, it holds paleontological significance, offering a glimpse into prehistoric marine ecosystems of the Late Cretaceous period. The geological conditions required for its formation are exceptionally specific, contributing to its limited geographical distribution and consequently, its value.
