gems, beryl, aquamarine, emerald, morganite, heliodore, goshenite

Treatments of beryl became commercially important at the beginning of the 20th century. By thermal enhancement, iron bearing beryls change from yellow, yellowish-green and green to blue colours. Furthermore, disturbing yellow or orange hues in morganites can be removed. Besides this, artificial irradiation is of relevance, to intensify yellow and pink colours, as well for special beryls with colour centres (Maxixe beryl resp. beryls of the Maxixe-type). In many cases, the limited detectability of these enhancements is problematic.