From coldstones website….
Is Cold Stone Creamery ice cream Kosher?
Although Cold Stone is not a kosher restaurant concept, the majority of our ingredients are kosher. The ice cream mix used to make Cold Stone ice cream is certified kosher, meaning that animal-based (beef, pork, etc.) ingredients cannot be used. The mono- and diglycerides we use are not from animal sources. Most of our ice cream flavors are also made with kosher ingredients. The agency certifications for the ingredients will vary depending on the product. In addition, several of our store locations are certified kosher. As all of our locations are individually owned and operated, you will need to ask your local store directly if they are certified kosher.