Switzerland Sapphire Diamond Marriage Fashion Necklace Jewellery 10057

 Switzerland Sapphire Diamond Marriage Fashion Necklace Jewellery  

By Aamir Mannan

Synthetic star sapphire

In 1902 the French chemist Auguste Verneuil developed a process for producing synthetic sapphire crystals.[42] In the Verneuil process, named after him, fine alumina powder is added to an oxyhydrogen flame, and this is directed downward against a mantle.[43] The alumina in the flame is slowly deposited, creating a teardrop shaped "boule" of sapphire material. Chemical dopants can be added to create artificial versions of the ruby, and all the other natural colors of sapphire, and in addition, other colors never seen in geological samples.