1 July 2010
The history of the Black Prince's Ruby, one of the world's most famous precious stones.
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1 December 1999
A history of spinel, including balas ruby and lodestone.
1 April 2007
The use of Fourier-Transform Infrared Spectroscopy (FTIR) in gem identification, with examples of sapphire & jadeite.
1 October 1994
This article discussed the ruby and spinel mines of Afghanistan/Tajikistan, in an attempt to shed light on one of the great gemological enigmas.
1 June 2008
Since the turn of the millennium, the price of fine spinel has risen at an incredible pace. No longer simply the poor man's ruby, spinel is finally getting the attention it deserves as one of the world's premier gems.