An overview of the Spring 2020 Gems & Gemology content.

Violent kimberlite eruptions impact the surface features of diamonds, which can give scientists useful information about how diamonds react with the fluids in the mantle.

Numerous needle-like inclusions exhibit vibrant interference colors in a suite of pallasitic peridot from the Jepara meteorite.

A ring made entirely of natural diamond was recently submitted to GIA’s New York laboratory.

A phenomenon resembling play-of-color was seen in a 4.13 ct unheated sapphire recently examined by the author.

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

Application of slight pressure perpendicular to the twinning planes reveals the unusual property of this synthetic gem.

Conspicuous bright brownish red crystals in ruby matrix are the first recorded observations of staurolite in corundum.

Afghani spodumene hosts an unidentified translucent orange crystal surrounded by an iridescent cleavage halo.

Orange crystal inclusion identified as the rare mineral triplite in a beryl from Pakistan.

The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.

Presents a quantitative means of determining the causes of color in a gem material, using corundum’s six major chromophores as an illustration.

Discusses the features of alkali elements and their influence on the color of blue to yellow beryl.

Chronicles developments at the Chivor emerald mine in Colombia between 1880 and 1925, based on archival records.

Investigates the chemical, physical, and gemological properties of attractive rhodonite-rich rocks from this Swiss deposit.

Explores the art form of jade carving in China across five periods from the late Neolithic Age to the present day.

A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.

Diamond inclusions are relatively common guests in diamond crystals.

A rare Burmese star peridot cabochon is characterized by a soft four-rayed asterism and extremely fine acicular inclusions.

Advanced analytic techniques are critical for separating Ethiopian feldspar from Oregonian and copper-bearing feldspar with undetermined color origin.