Group of Ammolite Cabochons
Southern Alberta, Canada
Ammolite was first discovered by the Black foot Indians in an area bordering the Canadian Rockies. In 1908 a member of the National Geological Survey team found mineralized opalescent fossil shells from prehistoric sea creatures known as ammonites along the St. Mary River in Alberta. It was not until 1981, however, that enough high quality ammolite was discovered to make mining commercially viable of this beautiful organic gem material. Ammolite is now considered to be Canadas finest gemstone. It has a mineral composition of aragonite (calcium carbonate), which is similar to that of pearls with multiple thin layers, which catch and reflect light. The iridescence, which occurs is created by light interference and reflection from these layers.
This lot includes five smaller freeform cabochons with excellent vivid red, green gold coloration and various patterns, in total weighing approximately 19.67 carats
; together with a single larger freeform ammolite, weighing approximately 9.80 carats. (5)