Nanodiamond is widely used in advanced industrial and biomedical applications due to its unique combination of hardness, chemical stability, and biocompatibility. In industrial settings, it serves as an ultrafine polishing agent for precision optics, semiconductors, and hard disk surfaces, delivering scratch-free finishes. It is also incorporated into lubricants and coatings to enhance wear resistance and reduce friction in mechanical systems.

In biomedicine, nanodiamond is used as a drug delivery carrier, enabling controlled release and improved solubility of therapeutic agents. Its surface can be functionalized to target cancer cells, making it valuable in oncology research. Additionally, nanodiamonds are employed in bioimaging due to their fluorescent properties when containing nitrogen-vacancy centers, allowing long-term cellular tracking without photobleaching.

Emerging applications include use in quantum sensing, composite materials for enhanced strength, and in electronics as heat-dissipating fillers. Its non-toxic nature and ability to cross biological barriers further expand its potential in diagnostics and therapeutics.

In the cosmetics industry, nanodiamonds are added to creams and skincare products to help exfoliate dead skin cells and stimulate skin renewal, resulting in brighter and smoother skin.