spectroscope

  • Describing Color in Gems | A Fool's Guide

    Describing Color in Gems • A Fool's Guide • Lotus Gemology

    Color types such as "pigeon's blood," "Paraíba" and "cobalt blue" have become wildly popular in the gem trade. But there is a vast difference between coining such terms and applying them in a way that is both consistent and logical. Richard Hughes casts a critical eye on the subject.

  • Gem Testing with the Spectroscope

    Focus on the Spectroscope


    Many gemologists have difficulty mastering the direct-vision spectroscope. This article eases the pain.