Article Search Results

Eight HPHT faceted synthetic diamonds from AOTC Group

Near-Colourless HPHT Synthetic Diamonds from AOTC Group

Ulrika F.S. D’Haenens-Johansson, Kyaw Soe Moe, Paul Johnson, Shun Yan Wong, Ren Lu, and Wuyi Wang, April 30, 2014

Presents the gemmological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.

Hunting for
“Jedi” Spinels in Mogok

Vincent Pardieu, April 30, 2014

Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.

Characterisation of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

Ahmadjan Abduriyim, et al.

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

Update on Ammolite Production from Southern Alberta, Canada

Keith A. Mychaluk

There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.

A Look Inside a Remarkably Large Beaded South Sea Cultured Pearl

Laura M. Otter, Ursula Wehrmeister, Frieder Enzmann, Martin Wolf, and Dorrit E. Jacob, April 30, 2014

A study of the nacre and the cavity of a large Pinctada maxima cultured pearl yields a theory on the specimen’s formation.

Liddicoatite Tourmaline from Anjanabonoina, Madagascar

Dona M. Dirlam, Brendan M. Laurs, March 1, 2002

Liddicoatite, a calcium-rich lithium tourmaline, was recognised as a separate mineral species in 1977, and named in honour of Richard T. Liddicoat.

Gemesis Laboratory-Created Diamonds

James E. Shigley, Reza Abbaschian, December 1, 2002

High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.

10 Study Samples Before and After HPHT Processing

GE POL Diamonds: Before and After

Christopher P. Smith, George Bosshart, September 1, 2000

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil

Franz Brandstätter and Gerhard Niedermayr, September 1, 1994

Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.

De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds

Marie-Line T. Rooney, C. M. Welbourn, March 1, 1993

De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition