Absolutely beautiful Petoskey stone handcrafted necklace. Genuine Petoskey stone pendant with silver crescent moon and silver chain necklace with lobster clasp. Petoskey Stone, Michigan's state stone, holds a rich geological history. Formed through the fossilization of ancient coral known as hexagon-aria, it can be found along the picturesque shores of Lake Michigan and Lake Huron. These fossilized corals thrived in the warm, shallow seas that covered Michigan approx. 350 million years ago during the Devonian era. Chain is approx. 20" long. Pendant is approx 1 1/2”. Stone is approx 3/4”. Please see photos.