Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance
Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.
Effects of Blue Fluorescence on Diamond Appearance, Color Treatment and Brightening of “Edison” Pearls, and a Pioneering Gemstone Market in Pakistan
An overview of the Summer 2021 Gems & Gemology content.
Namak Mandi: A Pioneering Gemstone Market in Pakistan
Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.
Mobile Inclusions in a Decorative Quartz Object
Inspired fashioning showcases mobile inclusions in a polished quartz specimen, reminiscent of an hourglass.
Iridescent Abalone Shell
The optical phenomenon of iridescence creates a beautiful pearly rainbow effect in an abalone shell.
Colorful Inclusions in Diamond
Inclusions can be found in a variety of different gemstones; they create a window that allows the viewer to picture a stone’s formation history.
Neptunite Inclusion in Benitoite
Raman analysis confirms that the yellow-orange to deep red inclusion in a faceted benitoite is indeed neptunite.
Transparent Rhodonite with Clarity Enhancement
A clarity-enhanced rhodonite stuns with its exceptional size, transparency, and vivid color.
CVD Laboratory-Grown Diamond with Counterfeit GIA Inscription
A CVD laboratory-grown diamond with a fraudulent GIA inscription is submitted to the Antwerp lab.
Exquisite Opal Strand
Natural opal beads displaying vibrant play-of-color are strung together to create a remarkable necklace.
Melo Pearl Found in a Melo Shell
A beautiful melo pearl is accidentally served up for lunch within its host gastropod.
Pearl Classification: The GIA 7 Pearl Value Factors
Provides a visual guide to GIA’s approach to classifying and describing pearls.
Detection of Color Treatment and Optical Brightening in Chinese Freshwater “Edison” Pearls
Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental techniques.
Yellow Fluid Inclusions in Transparent Sodalite
A rare transparent and near-colorless sodalite contains two-phase inclusions linking it to its ancient formation.
Summer 2021 G&G Publication Information
This document provides the publication information for Gems & Gemology
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