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Sapphire inclusion scene resembling a flower.
“Flower in the Rain” Inclusion in Sri Lankan Sapphire

A growth blockage/fluid inclusion combination in a blue sapphire from Sri Lanka resembles a bloom in a rainstorm.

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Surface-reaching growth tubes in a sapphire.
Growth Tube Cluster in Sapphire

Surface-reaching growth tubes in a sapphire provide insight into the gem’s origin and treatment history.

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Multi-colored gems are superimposed on an image of glacier peaks.
Article
Gems and Minerals from the Subarctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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Curved features in sapphire.
Curved Tubes in Blue Sapphire

Curved linear inclusions, unusual in corundum, are found in sapphire acquired in Vietnam.

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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

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Fall 2016 Gems & Gemology Cover
Article
Fall 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Color Change in Blue Zircon

A summary of the content found in the Fall 2016 issue of Gems & Gemology.

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Sapphire fragments from the Sutara placer, Russia
Sapphires from the Sutara Placer in the Russian Far East

Studies the formation and chemical composition of the largely unexamined alluvial sapphires from Russia’s Jewish Autonomous District.

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Blue Sapphire
Article
New Nigerian Source of Blue Sapphire

A preliminary report on blue sapphires from a new deposit in Nigeria's Mambilla Plateau.

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A Study of the Gems in Ciborium from Einsiedeln Abbey
A Study of the Gems in Ciborium from Einsiedeln Abbey

The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.

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Phase changes in sapphire
A Fantastic Display of Phase Changes in a Sapphire’s Fluid Inclusion

Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.

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