Ammolite ring 925-silver

12,9 ct ammolite. Natural color. Ring rail at its widest approx. 11mm, at its narrowest approx. 5,7mm. Thickness approx. 1,5mm. Length of the ring approx. 17mm, width approx. 16,2mm. Height approx, 6,3mm. Ammolite cabs are usually treated with a protective coating and a building back, so probably these are also made / produced / refined in this way. Ground parts of ammonite (fossil squid), Canada. Ammolite is found only on the eastern slopes of rocky mountains in the USA and Canada. These ammonites are large, ranging from palm-sized to up to meter-sized. Therefore, only cut pieces of the shell are found in jewelry. Ammolite was granted gemstone status in 1981, the same year that commercial mining began. Ammolite is an organic gemstone. Its opal-like shimmer of color is produced by thin layers of aragonite.