Diamond Nail File. The word Diamond" evokes images of beauty, elegance and romance, yet the diamond is also the hardest, most abrasive stone known to man. Diamancel has captured each of these qualities, creating a unique line of genuine diamond files. Each Flexible Diamond Nail File in the Diamancel family has been designed for specific nail types to beautifully shape and enhance both natural and sculptured nails. The Diamancel Diamond Hand and Foot Callus Files are ideal for removing and softening rough, dry skin."