Handbook of Gem Identification

Liddicoat presided over four decades of innovation in gem instrument development at GIA, and established gem instruments as one of the Institute's highest priorities. In addition to his early work with Shipley to develop the Diamolite, Liddicoat's scientific background enabled him to foster the development of instruments such as the prism spectroscope and the ProportionScope. His objective throughout instrument development at GIA was to provide jewelers with practical tools that could help them in the day-to-day operation of identifying gemstones.