Sweden Sapphire Diamond Marriage Fashion Necklace Jewellery 10058

Sweden Sapphire Diamond Marriage Fashion Necklace Jewellery   

By Aamir Mannan

rtificial sapphire material is identical to natural sapphire, except it can be made without the flaws that are found in natural stones. The disadvantage of Verneuil process is that the grown crystals have high internal strains. Many methods of manufacturing sapphire today are variations of the Czochralski process, which was invented in 1916 by Polish chemist Jan Czochralski.[44] In this process a tiny sapphire seed crystal is dipped into a crucible made of the precious metal iridium or molybdenum,[45] containing molten alumina, and then slowly withdrawn upward at a rate of 1 to 100 mm per hour. The alumina crystallizes on the end, creating long carrot-shaped boules of large size up to 200 kg in mass