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Winter 2023 G&G Available Now

Erica Zaidman, January 26, 2024

An overview of the Winter 2023 Gems & Gemology content.

Figure 1. Lidded goblet from the collection of the Bavarian National Museum in Munich, embellished with red Bohemian garnets. Inventory no. 60/74, height 17.7 cm. Photo by Bastian Krack; courtesy of Bavarian National Museum in Munich.

Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries

Karl Schmetzer, Hans Albert Gilg, and Hans-Jörg Ranz, January 26, 2024

Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.

Figure 1. This 2.20 ct Fancy Deep brownish orange treated HPHT-grown diamond owes its distinctive appearance to multiple defect concentrations created within the various growth sectors. Photo by Diego Sanchez.

Treated HPHT Laboratory-Grown Diamond with Dramatic Color Zoning

Sally Eaton-Magaña and Taryn Linzmeyer, January 26, 2024

A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.

37th International Gemmological Conference

Ahmadjan Abduriyim, January 26, 2024

A report from the 37th IGC, held in late October 2023 in Tokyo.

Texas Topaz, Slovak Opal, a Beryl Inclusions Chart, and More

Duncan Pay, January 26, 2024

An overview of the Winter 2023 Gems & Gemology content.

Figure 1. A good-quality 88.25 ct “chameleon” amber with a red bodycolor displaying a vivid green fluorescence color that appears to float on the surface. Photo by Yan Li.

The Special Color Effect in “Chameleon” Amber

Jinfeng Yang, Yan Li, and Youzhi Liang, November 3, 2023

An examination of three Burmese chameleon amber specimens using 3D fluorescence spectroscopy.

Figure 1. Faceted Oregon sunstone crystals (2.75–7.71 ct) representing the variety of colors observed. Photo by Adriana Robinson. Courtesy of the GIA Museum. Gifts of Western Ventures (pear shape), Dust Devil Mining Co. (oval), and John and Laura Ramsey (emerald cut on the far right).

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Shiyun Jin, Aaron C. Palke, Nathan D. Renfro, and Ziyin Sun, November 3, 2023

Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

CVD Diamonds with Invisible Markings

Shoko Odake and Priyanka Kadam, August 4, 2023

A new type of invisible marking in CVD diamonds suggests a possible security measure.

Figure 1. The 169.05 ct filled pearl, viewed from its face (left) and base (right). Note the indented feature on the base through which the filler material was inserted prior to plugging. Photos by Gaurav Bera.

A Partially Hollow Natural Blister Pearl Filled with Foreign Materials

Roxane Bhot Jain, Abeer Alalawi, Nicholas Sturman, and Chunhui Zhou, January 25, 2023

A very large baroque white pearl is further examined in the Mumbai laboratory due to its suspicious heft.

Laser cavities under different lighting conditions.

Graphitic Cavities on Diamond

Troy Ardon, July 22, 2020

An unusual series of graphitic cavities discovered on a star facet in a near-colorless round brilliant diamond may be explained by laser sawing.

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