Dr. Clive Washington
Senior Lecturer, University of Nottingham, U.K.
Tin, Corian, and Ceramic Lap Testing
Which laps and polishes can produce the flattest facets and sharpest edges on gemstones? Our lap testing compares tin, Corian,...
A Simple Method for Transposing Faceting Angles
Can something akin to a slide rule help novice faceters today with transposing faceting angles from published gem designs? Check...
Gemstone Radiation Treatment
Gemstone radiation is a common but little understood technique for altering gem colors. Learn how it works and what gems...