Stone: Ammonite Fossil
Chain/Closure: Leather cord with adjustable double slip-knot closure
Note: Please pick the color Ammonite/bail/leather you would like. You will receive a randomized individual Ammonite!
Since ammonites are natural fossils, please be aware that they are not uniform in size, shape, or color! I will hand pick your ammonite(s). Note, however, that the red variety is approx. 1- 1.25 inches in diameter (give or take), and the white pearlescent variety is about 1.25 - 1.5 inches (give or take).
All About Ammonites (Alliteration and All!):
These specimens come from the Mahajanga Province in Madagascar, and formed in the Middle Cretaceous period. They are about 110 million years old!
Ammonites resembled the modern-day nautilus, although they are more closely related to the octopus.
The term "ammonite" comes from the Egyptian god Amun, who had a ram's head (and these look like lil ram horns).
The shiny layer is called nacre. Basically, it's a thin layer of argonite leftover from the shell of the creature which still reflects/diffuses light in such a way that you get these rainbow or dazzling red displays. Think of an abalone shell for a modern-day example of nacre.
They are the perfect physical manifestation of the Fibonacci Sequence, and the derivative Golden Ratio. The Fibonacci Sequence is a sequence of numbers where the subsequent number equals the sum of the two numbers before it (1,1,2,3,5,8...). The golden ratio is derived from the dividing a subsequent number from the number before it (e.g. 3/2, 5/3, 8/5...). As you get into the higher numbers of the sequence, these quotients gets closer and closer to 1.61803..., which is the golden ratio! Like Pi, this number (named "Phi") is irrational, and is usually written as the Greek letter in mathematical equations since it's an ongoing number.
In any case, the shape of the shell follows the curves of the golden ratio!