The Verneuil process is a flame-melting process used to manufacture synthetic sapphires.

SAPPHIRE – SUPER PERFORMANCE WITH HIGH-TECH MATERIAL Naturally occurring sapphire belongs to the corundum group and is a crystal with the chemical composition AI2O3. As a sapphire, it is often blue varieties (barbel blue) but also green, yellow-orange or violet that are mentioned. The colour is influenced by the smallest amounts of dirt, and the substances that give the colour are most often titanium and iron. Synthetic sapphire…