Michigan Green Stone Silver Earring Studs - Also known as 'Chlorastrolite', Michigan Green Stone has a delicate natural pattern and a lovely green-to-dark color hue. It's been a treasure for over a hundred years, and comes primarily from the Lake Superior area. Simple and elegant, these little stud earrings show off your love of all things Mitten State. They're set in sterling silver and measure 6mm. Hand cut by a local lapidary.