- > Gems & Jewellery
- > Journal of Gemmology
- > Ordering Back Issues of the Journal
- > Samples
- > The Journal online
- > Issues 2008 to date
- > Schmetzer, 2010
- > Volume 31, Nos 1-2, 2008
- > Li Jianjun et al 2010
- > Sturman Teaching
- > Sturman and Parker optic sign
- > Sturman and Parker shadow edges
- > Schmetzer, Chrysoberyl, 2011
- > Andersson, Maxixe beryl, 2011
- > Schmetzer trapiche tourmaline
- > Duroc Danner
- > Schmetzer Lake Manyara
- > Pearson Ultraviolet sources
- > Ostrooumov and Morales 2010 (1)
- > Bidney et al., 2010
- > Kitawaki et al., 2010
- > Hänni et al., 2010
- > Volume 31, Nos 5-8, 2009
- > Hainschwang 2010
- > Vol. 31, Nos 3-4, 2008
- > Cowing, 2010
- > Issues prior to 2008
- > Submitting Articles for the Journal
- > Direct Subscribers
The Journal of Gemmology 2011
Untreated yellowish orange sapphire exhibiting its natural colour
J.M. Duroc-Danner, Dip. IUED, DUG, FGA, GG
Abstract: Orange sapphires of natural colour are rather rare. A 3.85 ct sapphire recently submitted for identification was confirmed as natural using conventional gemmological equipment and infrared spectrometry. Colour zoning, inclusions and twinning are described and compared with the features shown by synthetic sapphires.
All the Journal articles placed online in 2011 will also be published in hard copy as a single Journal issue and sent to all paid-up Gem-A members early in 2012 as part of their 2011 subscription. Gem-A members may login to the membership area to view the full articles.