Article Search Results

Types

Articles (221)

Content Type

Lab Notes (15) Gem News International (16) Reviews (3) Abstract (6) Feature (15) Micro-World (69)

Reviewed

Peer Reviewed (80)

Topics

See All Topics

Gemstones

Diamond (42) Sapphire (34) Ruby (24) Emerald (18) Pearl (8) See All Gemstones

XClear Selections

Iridescent Inclusion in Tanzanite

Danny Sanchez

November 7, 2016

A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.

Footprint-shaped iron hydroxide deposit in quartz

Shrinkage “Footprint” in Rose Quartz

John I. Koivula

April 28, 2016

A debris pattern within a rose quartz’s fracture resembles a dinosaur’s footprint.

Quarterly Crystal: Triplite in Topaz

John I. Koivula

August 3, 2016

The first triplite inclusion in a topaz host is examined.

Brazilian colorless topaz with molybdenite inclusions.

Molybdenite in Topaz

John I. Koivula

November 23, 2015

An unusual host-inclusion association is revealed when cluster of crystals in a colorless topaz is discovered to be molybdenite.

Amethyst with a large aqueous primary fluid inclusion

Large Aqueous Primary Fluid Inclusion in Amethyst

Ziyin Sun and Jonathan Muyal

November 7, 2016

A strikingly large primary fluid inclusion with a gas bubble was seen in a Moroccan amethyst.

Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

John I. Koivula, Kevin Nagle, Andy Hsi-Tien Shen, and Philip Owens

April 6, 2009

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.

Inclusions in Burmese Amber

Victoria Raynaud, Vincent Pardieu, and Wim Vertriest

August 3, 2016

Examples of Burmese amber specimens with well-preserved inclusions that have become available in recent years.

Composite Amber with an Unusual Structure

Jie Liang, Haibo Li, Taijin Lu, Meidong Shen, and Jun Zhang

January 31, 2014

This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.

Chart: Inclusions in Natural, Synthetic, and Treated Diamond

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

February 1, 2019

Provides a visual guide to the internal features of natural, synthetic, and treated diamonds.

Sapphires from Australia

Terrence Coldham

September 1, 1985

An overview of Australia's recent significance in the production of blue sapphire.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Shop the Campus Store

Quality Assurance Benchmarks

G&G Winter 2018 Edition