Synthetic gemstones

Numéro d’image : 11589453
Synthetic gemstones
Synthetic gemstones. Synthetic sapphires (left) and ruby (right) produced using the Verneuil process. Sapphires and rubies are both forms of the naturally occurring mineral corundum,an aluminium oxide. The only difference being their colour which is dependant on the impurities present. The Verneuil process uses powdered alumina (aluminium oxide) that is heated to 2000 degrees celsius in a furnace. This melts the powder,which forms a boule as it cools on a supporting rod. The different colours are obtained by adding chromium oxide for rubies,and ferric oxide for sapphires. The process produces gems that are chemically and physically equivalent to their naturally occurring counterparts
Licence : Droits gérés
Crédit: Science Photo Library / Wiersma, Dirk
Taille de l’image : 4368 px × 2912 px
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