World Gem Foundation
Advanced Gemmology

Advanced Gemmology Course

Prerequisites

Basic Gemmology

Lessons

Twenty-Two

Course Objective

In this course you will learn about imitation gemstones, the different methods used to manufacture lab-created gemstones, how to distinguish them from their natural counterparts, and how to detect the various treatments used to improve the appearance and/or value of gemstones.

Topics Covered Include

Imitation and composite gemstones, methods used to manufacture lab-created gemstones including Verneuil, Czochralski, Flux Melt, Hydrothermal, Skull Crucible, Zone Melt, Horizontally Oriented Crystallization, HPHT, CVD, Detonation, Ultrasonic Cavitation, Sublimation Method, and Modified Stober Method, their unique identifying features, treatments and enhancements including heat treatment, surface and sub-surface diffusion, lead glass fracture filling, flux assisted partial fissure healing, glass fracture filling, cobalt doped glass filled sapphires, clarity enhanced diamonds, HPHT, quench-crackling, surface modifications, coatings and foil backs, laser drilling, irradiation, and advanced gem testing techniques.