Michael S. Krzemnicki, Henry A. Hänni,, December 1, 2004
This article describes the first application of laser-induced breakdown spectroscopy (LIBS) to gemmology.
Read MoreJohn 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.
Read MoreChristopher P. Smith, June 1, 2002
A relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.
Read MoreJames E. Shigley, Shane F. McClure, March 1, 2001
Hydrothermal synthetic red beryl has been produced for jewellery applications.
Read MoreGary 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.
Read MoreKarl 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.
Read MoreSam Mulhmeister, Emmanuel Fritsch, June 1, 1998
Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.
Read MoreChristopher 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).
Read MoreKarl 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.
Read MoreChristopher P. Smith, September 1, 1996
This article presents the methods and instruments needed to analyse the internal growth structures of corundum.
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