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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. 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.

Thread-like inclusions of serpentine resembling an ancient text. Photomicrograph by Le Ngoc Nang; field of view 2.50 mm.

Ancient Script-Like Serpentine in Brown Peridot

Le Ngoc Nang, August 4, 2023

Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.

$This scene of an iron stain and numerous curved lines showing rainbow colors in a fracture resembles a scene from the night sky viewed through a telescope rather than a microscope. Photomicrograph by Charuwan Khowpong; field of view 2.85 mm.$

Night Sky in Yellow Sapphire

Charuwan Khowpong, August 4, 2023

Fiber-optic light creates a night sky scene in a yellow sapphire from Madagascar.

This pristine hexagonal platelet of graphite was seen in a pink sapphire from Sri Lanka. Photomicrograph by Jeffrey Hernandez; field of view 1.99 mm.

Pink Sapphire with Graphite Inclusion

Jeffrey Hernandez, August 4, 2023

A hexagonal platelet of graphite is discovered in a pink sapphire from Sri Lanka.

An opaque crystal, likely a metal sulfide, is suspended in a garnet. A combination of darkfield and oblique fiber-optic illumination makes it appear as though the crystal is hovering inside the stone. Portions of the inclusion are duplicated because of its split across several facet junctions, adding to the visual interest. Photomicrograph by E. Billie Hughes; field of view 4 mm.

Guest in Garnet: Metal Sulfide?

E. Billie Hughes, August 4, 2023

An intriguing metallic inclusion is observed in a faceted garnet.

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