It has become harder and harder to assess the real value of a gemstone since the emergence of synthetic diamonds, treated diamonds and nearly perfect imitates. Infrared spectroscopy is an elegant way ...

IN an article on “The Problem of the Two Types of Diamond” by Prof. G. B. B. M. Sutherland, D. E. Blackwell and W. G. Simeral 1, it is remarked that “in our experience all large diamonds of gem-stone ...