Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.

Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.

Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.

A look at the most popular phenomenal gems exhibited at the 2025 Tucson gem shows.

Uniquely saturated examples of the collector stone were on display at GJX.

A black opal cabochon set in a ring displays vivid orange play-of-color.

A summary of the findings at the 2025 Tucson gem shows.

Gemology has become a highly technical field employing analytical instruments for gem testing, driven by the need to address increasingly complex identification challenges in the marketplace.