About Dufresne Sing

Dufresne Sing is an experienced marble collector and enthusiast with a passion for teaching beginners how to identify, value, and collect these miniature works of art. From handmade German swirls to machine-made cat’s eyes, Dufresne demystifies the terminology and helps new collectors spot valuable finds. This course covers identification techniques, understanding makers, recognizing rare types, and building a meaningful collection—whether you’re hunting at estate sales or inheriting grandma’s jar of treasures.