Article Search Results

A New Method for Detecting Be Diffusion-Treated Sapphires: Laser-Induced Breakdown Spectroscopy (LIBS)

Michael S. Krzemnicki, Henry A. Hänni,, December 1, 2004

This article describes the first application of laser-induced breakdown spectroscopy (LIBS) to gemmology.

Beryllium Diffusion of Ruby and Sapphire

John L. Emmett, et al., June 1, 2003

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

“Diffusion Ruby” Proves to be Synthetic Ruby Overgrowth on Natural Corundum

Christopher P. Smith, June 1, 2002

A relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.

Hydrothermal Synthetic Red Beryl from the Institute of Crystallography, Moscow

James E. Shigley, Shane F. McClure, March 1, 2001

Hydrothermal synthetic red beryl has been produced for jewellery applications.

Ruby and Sapphire from Jegdalek, Afghanistan

Gary W. Bowersox, Eugene E. Foord, June 1, 2000

This study provides detailed mining and gemmological information on the Jegdalek deposit, in east-central Afghanistan, which is hosted by elongate beds of corundum-bearing marble.

Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires

Karl Schmetzer and Adolf Peretti, March 1, 1999

Most Russian hydrothermal synthetic rubies and pink, orange, green, blue and violet sapphires—coloured by chromium and/or nickel—reveal diagnostic zigzag or mosaic-like growth structures associated with colour zoning.

Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry

Sam Mulhmeister, Emmanuel Fritsch, June 1, 1998

Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.

Rubies and Fancy-Colour Sapphires from Nepal

Christopher P. Smith, Edward J. Gübelin, March 1, 1997

Gem-quality rubies and fancy-colour sapphires have been recovered from dolomite marble lenses located high in the Himalayan mountains of east-central Nepal (Ganesh Himal).

Trapiche Rubies

Karl Schmetzer, Henry A, Hänni, December 1, 1996

Ruby crystals from Southeast Asia with a fixed six-rayed star, similar in effect to trapiche emeralds from Colombia, are described.

Introduction to Analysing Internal Growth Structures: Identification of the Negative d Plane in Natural Ruby

Christopher P. Smith, September 1, 1996

This article presents the methods and instruments needed to analyse the internal growth structures of corundum.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition