Ammolite, is an opal-like organic gemstone found primarily along the eastern slopes of the rocky mountains of north america. It is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite, the same mineral that makes up nacreous pearls. It is one of few biogenic gemstones. Others include amber and pearl. In 1981, ammolite was given official gemstone status by the world jewellery confederation (CIBJO). The same year commercial mining of ammolite began.
Compared to most other gems, ammolite has a rather scant history of use. It did not begin to garner interest in western society until the 1970s after entering the market (to a limited degree) in 1969.
In the late 1990s, practitioners of feng shui began to promote ammolite as an "influential" stone with what they believe is the power to enhance well-being and detoxify the body by improving its flow of energy or "chi". named the "seven color prosperity stone", each color is believed by feng shui practitioners to influence the wearer in different and positive ways. A combination of ruby red, emerald green, and amber yellow is most sought after for this purpose, the colors being said to enhance growth, wisdom, and wealth, respectively.
Ammolite is usually fashioned into freeform cabochons and mounted in gold, with diamonds as accents. Due to its delicacy, ammolite is best reserved for use in pendants, earrings, and brooches. If used as a ring stone, ammolite should be given a hard protective cap, namely one of synthetic spinel as used in triplets. Whole polished ammonites of appropriately small size may also be mounted in jewelry. Nothing harsher than mild soap and warm water should be used to clean ammolite jewelry. Ultrasonic cleaning should be avoided.