Check the listing for details. Fluorite Slab, Diamond Shape, Polished Decorative Stone Make an offer.. Condition: Used. Listed at 31.00 USD. It is a unique decorative stone in the form of a diamond-shaped slab of fluorite, a mineral known for its beautiful and varied colors. The polished surface adds an extra touch of elegance, making it a striking addition to any collection or as a standalone decorative piece. With its striking appearance and high quality finish, this fluorite slab is sure to be a standout item for collectors or enthusiasts of lapidary materials.