Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
Observations on HPHT-Grown Synthetic Diamonds: A Review
Summarises statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.
Characterisation of Mg and Fe Contents in Nephrite Using Raman Spectroscopy
Evaluates the usefulness of Raman spectroscopy in distinguishing the colour varieties of nephrite based on the relative ratio of Mg to Fe concentration.
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemmology
Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.
Jaipur, India: The Global Gem and Jewellery Power of the Pink City
Examines Jaipur’s role as a coloured stone cutting and jewellery manufacturing centre, with profiles of 17 companies and their factory, trading and retail operations.
6 Tips for the Best Gem Photos
Renowned gem photographer Robert Weldon offers his tips for capturing the best gem photographs.
Optimising Face-Up Appearance in Coloured Gemstone Faceting
How contrast patterns can increase perceived brightness and optimise a gemstone's appearance.