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Tourmaline
Tourmalines have a wide variety of exciting colors with one of the widest color ranges of any gem.
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Tourmaline in Tourmaline
A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.
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Whimsical Growth Tubes in Tourmaline
Microscopic examination reveals intriguing growth tubes in a copper-bearing tourmaline.
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Gaseous Carbon Dioxide Phases in Paraíba Tourmaline
Immiscible two-phase fluid inclusions are investigated in a 0.48 ct Paraíba tourmaline.
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Paraíba Tourmaline Melee: An Entry-Level Market Perspective
A look at Paraíba tourmaline melee, which offers a more accessible price point for consumers.
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Lepidolite in Copper-Bearing Tourmaline
A prismatic colorless lepidolite crystal is observed in a copper-bearing tourmaline.
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Mineral Assemblage of “Paraíba Matrix”
The contents of two “Paraíba matrix” samples are analyzed.
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Unique Moiré-Pattern Metallic Inclusion in Paraíba Tourmaline
An intriguing inclusion scene is analyzed in a Paraíba tourmaline from Brazil.
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Micro-Features of Tourmaline
Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.
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Brazilian Watermelon Tourmaline with Iris Effect
A pair of watermelon tourmaline slices from the Cruzeiro mine displays a rainbow of colors.
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In Memoriam: Heitor Barbosa
The life of the discoverer of Paraíba tourmaline is remembered.
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