Gems & Gemology Summer 1962, Vol. 10, No. 10

Developing the Powers of Observation in Gem Testing

According to Richard Liddicoat, the critical thinking process necessary for gem identification can be compared to the keen detective work of a Sherlock Homes. In this detailed look at the step-by-step procedures for pinpointing the identity of a given gem, Liddicoat stresses the importance of observation and perception. The gem identification techniques taught at GIA for more than 50 years have their foundation in these basic methods.