Lectures

Richard Hughes examines the nomenclature of jade, along with the remarkable renaissance in Chinese jade carving that has occured since the 1990s.

Richard Hughes discusses al-Bīrūnī, the great gemologist of the Islamic world.

Richard Hughes examines the historical sources of jade, along with the remarkable renaissance in Chinese jade carving that has occured since the 1990s.

Richard Hughes examines the nomenclature of jade, along with the remarkable renaissance in Chinese jade carving that has occured since the 1990s.

Billie Hughes reports the results from our low-temperature heat treatment experiments on Burmese ruby, with Japanese translation by Masaki Furuya.

Lotus Gemology's E. Billie Hughes will review key gemological features of Madagascar sapphire and how to detect heat treatment of this material.

Billie Hughes and Olivier Segura discuss the fascinating world of colored diamonds.

An in-depth look at ruby and sapphire treatments across history, examining the techniques, their market impact, and how labs detect them today.

Color types such as "pigeon's blood," "cobalt blue" and "Santa Maria" are wildly popular, but also wildly inconsistent. Richard Hughes takes a deep dive into the problems of describing color.

Billie Hughes will share how patterns emerge when we study pairs and sets of inclusion photomicrographs.

Color types such as "pigeon's blood," "cobalt blue" and "Santa Maria" are wildly popular, but also wildly inconsistent.

Lotus Gemology's E. Billie Hughes will review key gemological features of Madagascar sapphire and how to detect heat treatment of this material.

Color types such as "pigeon's blood," "cobalt blue" and "Santa Maria" are wildly popular, but also wildly inconsistent.

Lotus Gemology's E. Billie Hughes will review the major treatments of ruby and sapphire and how they can be identified.

Richard Hughes examines the nomenclature of jade, along with the remarkable renaissance in Chinese jade carving that has occured since the 1990s.