Millstones used for grinding grain like wheat, corn, and barely have been around for thousands of years. Grooves on the wide side allowed the crushed grain to move out and away from the stone. The groove style varied according to the preferences of the stone cutter or the miller.
Small stones that resemble millstones may actually be grinding wheels. There are also reproductions on the market as they are popular garden ornaments. To learn more about millstones and how to age them visit a historic mill in your area or check out the Society for the Preservation of Old Mills.
Authentic old millstones can fetch thousands of dollars. Selling one comes with the challenge of transportation as they can weigh thousands of pounds.