Ruby – Lab-made, Faceted, Red

Ruby gemstones are ideal for calibrating a spectroscope's scale. Our basic spectroscope instructions will show you how to do this. A synthetic ruby, like this brilliant-cut stone, is an affordable option for novice gemologists. Photo by James St. John. Licensed under CC By 2.0.

Article: Spectroscope Instructions for Novice Gemologists

Credit: James St. John