The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.

Offers a systematic evaluation of rose cuts produced for various colored stones in the latter seventeenth century, based on the examination of rare artifacts that belonged to the archbishops and prince-electors of Trier and Cologne.

The GIA lab in Carlsbad recently had the opportunity to examine a truly “all-American” diamond.

Progress in creating laboratory-grown CVD diamonds allows for larger sizes, including the largest yet seen at the Carlsbad lab.

Proposes a formation model for sapphire from the main deposits in southern Vietnam based on the chemical composition of their mineral inclusions.

Presents a combination of observational and spectroscopic means to separate the three main geographic localities for blue amber, which shows very strong blue fluorescence under sunlight or D65 illumination.

Studies the effects of low-temperature heat treatment on inclusions in this gem material, as well as the use of FTIR spectroscopy to detect the treatment.

Diamond ages offer insight into continent evolution spanning billions of years.

Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District.

The annual Tucson Gem and Mineral Show has been a reliable source for the niche and the unusual, as seen with the rhodium-plated iron meteorites acquired by author BL at the 22nd Street Show in February 2020.

A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.

A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.

Black opaque octahedral inclusions with yellow staining confirm the presence of chromite inclusions in an interesting common opal.

An orange rutile crystal unusual for its elongated shape appears in a faceted 4.24 ct blue sapphire from Afghanistan.

The combination of an iron sulfide crystal and a fingerprint enlivens the inclusion scene in a faceted sapphire from Sri Lanka.

A large tanzanite loses its appeal with the removal of its fracture-filling oil.

A long-wave ultraviolet flashlight illuminates chalky blue fluorescence in a fracture-filled emerald.

Orange spessartine garnet inclusions are featured in this aquamarine recovered from the Shigar Valley in Pakistan.

Color engineering with artificial irradiation turns a pinkish purple Argyle diamond light blue.

A garnet is cut and faceted to highlight its unusual inclusion.