The 3543 CM-1 Infrared Absorption Band in Natural and Synthetic Amethyst and its Value in Identification
The proper use and limitations of IR spectroscopy for identifying natural versus synthetic amethyst of various types have been investigated, focusing on the region 3800–3000 cm-1.
Abstracts; Summer 1991
From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
Insights From Inclusions
Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.
Abstracts; Autumn 1991
This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning
Where there are no inclusions or colour zoning, the presence of Brazil twinning in the natural amethyst will usually make the distinction.