Technical Evolution and Identification of Resin-Filled Turquoise
Provides criteria for detecting the resin filling of turquoise, an advanced treatment that reduces porosity and can dramatically improve appearance and stability.
How to Calculate Color from Spectra of Uniaxial Gemstones
Presents a method for accurately predicting the color of a gem material when viewed in any direction as long as the polarized spectra and the viewing angle relative to the c-axis are known.
Internal Structures of Known Pinctada maxima Pearls: Natural Pearls from Wild Marine Mollusks
Presents the internal characteristics of natural P. maxima pearls, obtained from real-time microradiography (RTX) and X-ray computed microtomography (µ-CT) analysis of 774 samples.
Micro-Features of Spinel
Provides a visual guide to the internal features of natural, synthetic, and treated spinel, as well as inclusions of spinel in other gemstones.
Prida Tiasuwan (Pranda Jewelry Group)
Remarkably Large Iridescent Healed Fissures Resembling Play-of-Color in Sapphire
Attractive iridescence creates a beautiful “play-of-color” effect on dendritic healed fissures in a blue sapphire.
Bicolor Rough Diamond Crystals
Two Australian rough diamonds demonstrate both pink and colorless sections in the same crystal.
Diamond-Shaped Cloud in Diamond
In a delightful juxtaposition, a diamond-shaped cloud inclusion appears in the center of a 0.53 ct round brilliant diamond.
Rare Faceted Hexagonite
The Carlsbad laboratory recently examined an unusually large faceted hexagonite with iridescent cleavage cracks and needle-like structures.
Somewhere in the Rainbow Finds a Home at the Alfie Norville Gem and Mineral Museum
A beautiful new gem and mineral museum in Tucson is home to the stunning Somewhere in the Rainbow collection.
Virtual Report on the Industry in 2021
An overview of how the gem and jewelry trade, from miners to manufacturers, and from designers to dealers, dealt with the many challenges posed by the pandemic.
Expanded Diamond Surface Due to Radiation Staining
The author examined a 0.56 ct Fancy grayish bluish green diamond with prominent green radiation stains.
Unusual Fluorescence of a Color-Enhanced Amber Bracelet
Abnormal fluorescence supports the likelihood that this amber bracelet had been “baked” to enhance its color.
Opal with Fluid Inclusion and Mobile Bubble
The Carlsbad laboratory recently examined a Mexican opal containing a rare fluid inclusion with a freely moving gas bubble.
Thin-Film Fluid Inclusions in Aquamarine
Oblique fiber-optic illumination of thin-film fluid inclusions in Brazilian aquamarine reveals a kaleidoscopic play of interference colors.
Fourth Annual Gianmaria Buccellati Foundation Award
A graduate of GIA’s Hong Kong Jewelry Design program hopes her award-winning design will help raise environmental awareness.
Asterism in Natural Diamond Cabochons
Two cabochons displaying white four-rayed “stars” are fashioned from one large natural diamond crystal.
Quarterly Crystal: Topaz with Phlogopite
A singly-terminated topaz from Pakistan hosts a prominent phlogopite crystal with strong dichroism and lamellar cleavage planes.
Spring 2021 G&G Publication Information
This document provides the publication information for Gems & Gemology
In Memoriam: Jean Claude Michelou
The gem and jewelry industry mourns the loss of one of its true leaders.
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