Goniatites are the earliest known predecessors of ammonites; they are small, ranging in diameter from 2 to 6 inches. One popular form of jewelry for all ammonites is the polished pendant, and goniatites are no exception. Their small size makes them ideal for wearing in pendants and necklaces, although they are desired by collectors in loose fossil form as well as embedded in rock slabs for showpieces. Goniatites can be found in Europe, North America, Australasia, and North Africa in areas that would have been subtropical during the time of the ammanoids' lifetimes.
Ceratites are a rarer form of ammonoid and are collected primarily as sculptures or individual fossils. Most ceratites are found in Germany due to the fact that the area was covered in water during the lifetime of this ammonite predecessor. Known for their four-lobed chambers, ceratites make a good addition to an ammonoid collection.
Ammonites are the most advanced form of ammonoid and are the most sought-after ammonoid from a collectible standpoint. These make excellent pendants and necklaces, especially when sawed down the middle and polished to showcase the ammonite's beautiful chambers. Ammonites are deposited in North America, Europe, Asia, and other places that were under the sea during the Jurassic and Cretaceous periods. They reached larger sizes than their ancestors, sometimes achieving 2 feet in diameter. Such large ammonite specimens are sought-after collectibles, as are smaller ammonites still caught in either a block of stone or stone that has been formed into a sculpture.
One of the most desirable forms of ammonite is ammolite, a high-quality gemstone formed from the shells of ammonite. Ammolite can only be found in the Rocky Mountains of North America, and the vast majority of all ammolite comes from Korite International out of Alberta, Canada. A few small private companies also mine a small amount of ammolite, along with small amounts of surface finds around the Rockies. Ammolite is collected in jewelry form in necklaces, rings, and other forms of jewelry as well as in rarer shell form. The beautiful stained-glass patterns present in full-shell form make full shells desired by ammonite collectors.
Touchstone Gallery of Arizona and New Mexico has a wide variety of ammonites and ammolites for sale. These stunning loose and stone-mounted ammonites and ammolites would make a fine addition to any ammonite or fossil collection. www.touchstone-gallery.net