Auguste Victor Louis Verneuil

A sketch of an early furnace used by Verneuil to synthesise rubies using the Verneuil process.

Auguste Victor Louis Verneuil (; 3 November 1856 – 27 April 1913) was a French chemist who invented the first commercially viable process for the manufacture of synthetic gemstones. In 1902 he discovered the "flame fusion" process, called the Verneuil process, which is an inexpensive method of making artificial corundum, or rubies and sapphires. When he was 17, chemist Edmond Frémy accepted him as a laboratory assistant. The process which bears his name remains in use today as an inexpensive means of making artificial corundum, or rubies and sapphires.