Using a diamond dust polish on your car will give it a long-lasting shine and protect it from scratches. Personal Care. The beauty industry also uses of diamond dust in ways to help us take good care of our bodies. Diamond dust particles are used in steel nail files to keep them sharp. Nail polish that strengthens nails and protects them from chipping include diamond dust as an important ingredient. Skin care is also known to use diamond dust, to remove old dead skin and invigorate the skin. Some jewelry is also made by combining diamond dust with quartz crystals. Every part of a diamond is useful, and all types of diamonds are valuable– even if they possess imperfections like industrial diamonds, and even when they are too tiny to see clearly like diamond dust. Learn also about diamond powder.