corundum, ruby, sapphire, synthetic corundum.7, treatments.6, properties.3, color.4, inclusions.5, gems

Anderson’s Gem Testing is one of the most important gemology books of the 20th century. Revised many times as gemology changed, after his death, Alan Jobbins continued the tradition. Not surprisingly, this is the best of the editions, and should be on the shelf of every gemologist. In 2013, Anderson was named in the French Association of Gemmology’s 50 most influential gemmologists of all time.