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Suite containing over 36 carats of Yogo sapphire

Gemological Characterization of Sapphires from Yogo Gulch, Montana

Nathan D. Renfro, Aaron C. Palke, and Richard B. Berg

August 6, 2018

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

Fancy Dark brown to Fancy black Marange diamonds

Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Karen V. Smit, Elina Myagkaya, Stephanie Persaud, and Wuyi Wang

August 6, 2018

Characterizes a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

Burmese phenakite with perettiite-(Y) bundles (left) and tusionite inclusions (right).

Perettiite-(Y) and Tusionite Inclusions in Phenakite from Myanmar

Jaroslav Hyršl

August 9, 2018

Seldom-seen inclusions are found in a host material that is rare in its own right.

Star Spinel with Four and Six Rays

E. Billie Hughes

August 9, 2018

A cabochon displaying asterism is found to be an untreated spinel with two different stars.

Mushroom in Copal

Rebecca Tsang

August 9, 2018

A Mexican copal plays host to a well-preserved mushroom.

Merelaniite whisker inclusions in tanzanite.

Merelaniite Inclusions in Tanzanite

Augusto Castillo, Tyler Smith, and John A. Jaszczak

August 9, 2018

A recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.

Topaz from Pakistan with microlite inclusions.

Microlite Crystals in Topaz from Pakistan

Jaroslav Hyršl

August 9, 2018

Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.

Raman analysis identified the horse-shaped inclusion as phlogopite mica.

A Horse-Shaped Inclusion in Pink Sapphire from Mozambique

Charuwon Khowpong

August 9, 2018

Microscopic examination of a Mozambican pink sapphire reveals an inclusion with a surprising shape and composition.

Digital Photomicrography for Gemologists

Nathan Renfro

July 31, 2015

A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.

Russian demantoids with pure color and horsetail inclusions

Update on Russian Demantoid Production

Wim Vertriest

May 11, 2018

Alexey Burlakov shares insights on the current production of Russian demantoid and emeralds.

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