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Fall 2023 G&G Available Now

Erica Zaidman, November 3, 2023

An overview of the Fall 2023 Gems & Gemology content.

Figure 1. Two traditional Indian-style pearl nose rings (<em>nath</em>) set with colored gemstones and pearls measuring approximately 6.63 × 6.09 mm to 8.42 mm (left) and 5.38 mm to 8.02 × 7.61 mm (right). Photo by Gaurav Bera.

Pearls in Traditional Indian Nose Rings

Lubna Sahani, Abeer Al-Alawi, and Roxane Bhot Jain, November 3, 2023

Two Indian-style pearl nose rings are examined in the Mumbai laboratory.

Figure 1. Isognomon isognomon shell and blister. The shell measures approximately 107.76 × 72.39 mm. Photo by Gaurav Bera.

Shell Blister on an Isognomon isognomon Shell

Prasad Mane, Nishka Vaz, and Abeer Al-Alawi, November 3, 2023

An Isognomon isognomon shell with a blister feature is examined at GIA in Mumbai.

Figure 1. Yongchuliao samples collected for testing. The rough sample on the left weighs 30.1 ct, and the carving on the right weighs 12.85 ct. Photos by Shilong Xu.

Blackish Green Omphacite Jade from Guatemala

Shilong Xu, Quanli Chen, Yan Li, and Xianyu Liu, November 3, 2023

A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.

Morphological features of the tourmaline crystal included in the heliodor are visible; striations and triangular growth marks are present. A band of fluid inclusions is visible near the tip of the schorl tourmaline. Photomicrograph by Rhiana Elizabeth Henry; field of view 2.90 mm. Gift of Mark Mauthner, GIA Museum no. 37772.

Heliodor with a Large Schorl Inclusion

Rhiana Elizabeth Henry, November 3, 2023

An 8.33 ct rectangular heliodor displays two tourmaline inclusions and a thin band of fluids.

$Figure 1. An 8.57 ct heart-shaped fracture-filled ruby treated with a zinc glass filling. Photo by Adriana Robinson.$

Translucent Ruby Filled with Zinc Glass

Shiva Sohrabi and Amy Cooper, November 3, 2023

Examination of a heart-shaped ruby reveals a zinc glass filler.

Figure 1. An unusual ruby with coloring reminiscent of a nebula found in the depths of outer space. Photo by Adriana Robinson.

“Nebula” Inclusion in Ruby Beryllium-Diffused to Heal Fractures

Michaela Damba, November 3, 2023

Fingerprints resulting from a flux-assisted heating process give a purple-red ruby a unique appearance.

Figure 1. A white button-shaped atypical bead cultured pearl weighing 8.15 ct and measuring 11.73 × 11.35 × 9.03 mm. Photo by Gaurav Bera.

Flame-Like Surface Structure in a Nacreous Atypical Bead Cultured Pearl

Prasad Mane, Nishka Vaz, and Abeer Al-Alawi, November 3, 2023

A white button-shaped nacreous pearl displays rare flame-like structure.

Figure 1. A Bombay bunch consisting of nine hanks and 553 high-quality natural pearls ranging from 3.83 to 5.72 mm. Photo by Gaurav Bera.

A Traditional Bombay Pearl Bunch

Pfokreni Nipuni, Abeer Al-Alawi, and Roxane Bhot Jain, November 3, 2023

GIA’s Mumbai laboratory reports on the examination of an 80-year-old collection of pearls from the Arabian (Persian) Gulf.

Figure 2. Left: The deep-UV (<230 nm) fluorescence image showed blue coloration (due to the presence of dislocation bundles) that appeared nominally similar to DiamondView images of natural type IIa diamonds. Right: When the fluorescence was filtered by an orange long-pass filter that blocked wavelengths below 550 nm, the NV-related fluorescence and the striations indicative of CVD growth became apparent. Image by Sally Eaton-Magaña (right).

CVD-Grown Diamond with Few Diagnostic Features

Sally Eaton-Magaña, November 3, 2023

A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.

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