The Petoskey stone is a treasure sought out by many who visit the beaches of northern Michigan. Varied on the surface, each stone is a fossil of colonial coral believed to have lived in waters more than 350 million years ago. This 34mm Birdy features a gold PVD case and bracelet and a dial crafted from a polished Petoskey stone which shines in its unique beauty. Enjoy a timepiece that's beautiful—and has a story to tell. Petoskey stone can vary in pattern and color. No two are the same.