Diamond with Concentric Inclusions
A fancy-color diamond shows inclusions that outline growth layers.
Types
Content Type
Reviewed
Topics
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Topics
close- Inclusions (170)
- Identification (52)
- Localities (48)
- Gemology (35)
- History (35)
- Color (32)
- Techniques (27)
- Geology (26)
- Synthetics (25)
- Mining (24)
- Physical properties (23)
- Chemical Composition (21)
- Optical Properties (21)
- Treatment Process (21)
- Mineralogy (20)
- Enhancement (15)
- Jewelry (15)
- Optical Effects (14)
- Instrumentation (13)
- Crystal structure (12)
- Formation (11)
- Technology (11)
- Clarity (10)
- Synthesis Process (10)
- Education (9)
- Material properties (9)
- Manufacturing (8)
- Imitations (7)
- Trade (7)
- Grading (6)
- Precious Metals (5)
- Cut (4)
- Fashion (4)
- Organics (4)
- Tools (4)
- Design (3)
- Quality Factors (3)
- Assembled Stone (2)
- Faceting (2)
- Metals (2)
- Pricing (2)
- Ongoing Research (1)
- Recent Findings (1)
Gemstones
- Sapphire (30)
- Diamond (27)
- Ruby (23)
- Emerald (18)
- Pearl (8)
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Gemstones
close- Sapphire (30)
- Diamond (27)
- Ruby (23)
- Diamond - Fancy Color (18)
- Emerald (18)
- Garnet (15)
- Tourmaline (12)
- Spinel (11)
- Topaz (9)
- Pearl (8)
- Amethyst (7)
- Opal (7)
- Amber (6)
- Aquamarine (6)
- Alexandrite (3)
- Jade (3)
- Moonstone (3)
- Peridot (3)
- Rose Quartz (3)
- Zircon (3)
- Tanzanite (2)
- Iolite (1)
- Morganite (1)
- Sunstone (1)
- Turquoise (1)
(170) results
Fall 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source
Russell Shor, November 4, 2015G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.
Peer Reviewed Article
Amethyst from Boudi, Morocco
Fabrizio Troilo, Abdelghani El Harfi, Salahaddine Mouaddib, Erica Bittarello, and Emanuele Costa, April 30, 2015An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.
Peer Reviewed Article
Characteristics of Gem-Quality By-Product Synthetic Zincite
Ji Zhang, Yujie Gao, and Guanghai Shi, May 8, 2017Investigates the properties of synthetic zincite produced by industrial kilns in Poland.
Peer Reviewed Article
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, 2009Several 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.
Gems and Minerals from the Subarctic
Sharon Bohannon, March 17, 2017Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
Inclusions in Natural, Synthetic, and Treated Emerald
Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, January 27, 2017Provides a visual guide to the internal features of natural, synthetic, and treated emeralds.
Curved Tubes in Blue Sapphire
Victoria Raynaud, Wim Vertriest, and Vincent Pardieu, January 27, 2017Curved linear inclusions, unusual in corundum, are found in sapphire acquired in Vietnam.
Quarterly Crystal: Growth Features on Titanite
John I. Koivula, January 27, 2017Dramatic growth features are found on the surface of a titanite specimen from Russia.
Optical Effects of Phenomenal Cabochons
Sharon Bohannon, November 10, 2016Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.
