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

Madagascar Sapphire: Low-Temperature Heat Treatment Experiments

Madagascar has become one of the world’s top sources of fine blue sapphire in recent times. In addition to beautiful untreated material, increasing numbers of treated stones have appeared in the market. Billie Hughes will review Lotus Gemology's heat treatment experiments of this material, including before-and-after photomicrographs, spectroscopy, and fluorescence results.

When
Thursday, 23 October 2025, 13:20 pm

Where
38th International Gemmological Conference
Athens, Greece