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Figure 1. The deep colors of green and brown augite from Dong Nai, observed in transmitted light. Top: The 9.78 g rough on the left yielded a 24.20 ct carving (24.99 cm in height). Bottom: The 11.22 g rough on the left yielded a 56.10 ct carving (36.50 cm in height). Photos by Le Ngoc Nang.

Gem-Quality Augite from Dong Nai, Vietnam

Le Ngoc Nang, Lam Vinh Phat, Pham Minh Tien, Pham Trung Hieu, Kenta Kawaguchi, and Pham Minh, August 4, 2023

Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.

Gemmes

GIA Staff, August 4, 2023

Swiss-based Gemmologie & Francophonie launches a new French-language digital publication.

Figure 1. An 11.68 ct treated phantom opal in which the phantom structure appeared during experiments with various solutions. The sample is shown under daylight through the dome (left) and under halogen lighting through the bottom (right). Photos by Le Ngoc Nang.

A New Treatment: Creating Phantom Structure in Opal

Le Ngoc Nang and Pham Minh Tien, August 4, 2023

A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.

Figure 1. Greenland’s rubies are characterized by abundant twinning planes. The twinning planes are not altered by the treatment at a larger scale, but features associated with the twinning can be significantly affected by heating. Photo by S. Wongchacree; field of view 14.40 mm.

Characteristics of Treated Rubies from Greenland

Martin Viala, Wim Vertriest, Charuwan Khowpong, and Suwasan Wongchacree, August 4, 2023

An overview of the treatment process of ruby and pink sapphire from Greenland and its effect on inclusion scenes and chemistry.

Figure 1. “Rabbit hair” quartz samples with different colors. Photos by Shuqian Rui.

Special Hair-Like Inclusions in Quartz

Qian Zhang, Shuqian Rui, Xingtong Li, and Jinyu Zheng, August 4, 2023

A close look at inclusions in a variety of “rabbit hair” quartz samples.

Figure 1. The white and cream non-nacreous pearl weighing 0.29 ct and measuring 3.75 × 3.55 mm. Photo by Gaurav Bera.

Calcite Present in a Pearl from Pinctada maculata

Anukul J. Belanke, Roxane Bhot Jain, Nishka Vaz, and Abeer Al-Alawi, August 4, 2023

Examination of a Pinctada maculata pearl reveals an interesting columnar calcite surface structure.

Figure 1. Emerald and matrix suite, 112.25 carats total. Photo by Jessa Rizzo.

Unique Colombian Emerald and Matrix Suite

Jessa Rizzo, August 4, 2023

A look at a unique matching set of emerald and brown matrix cabochons from the Muzo mine in Colombia.

Figure 1. This 29.60 × 23.84 × 18.35 mm cluster of well-formed isometric fluorite and monoclinic geocronite crystals was recently discovered at the Milpo mine in Peru. Photo by Annie Haynes.

Quarterly Crystal: Geocronite in Fluorite

John I. Koivula and Nathan Renfro, August 4, 2023

A cluster of well-formed fluorite and geochronite crystals was recently discovered in Peru.

Figure 1. A 30.80 ct faceted quartz containing pinkish orange inclusions. Photo by Hongtao Shen; courtesy of Jinrui Dong.

Triplite Inclusions in Quartz from Yaogangxian, China

Qian Zhang, Xingtong Li, and Hongtao Shen, August 4, 2023

Pinkish orange crystal inclusions in a faceted quartz are identified as the rare phosphate mineral triplite.

Figure 1. A 2.52 ct oval modified brilliant Paraíba tourmaline. Photo by Adriana Gudino.

Interesting Metallic Platelets in a Brazilian Paraíba Tourmaline

Shiva Sohrabi and Amy Cooper, August 4, 2023

Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.

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