Master Stones

Master stones are a set of gemstones used as a color comparison standard for grading diamonds and other gemstones.

Part of speech: noun
Definition: Master stones refer to precisely graded set of gemstones that serve as a benchmark for color grading within the jewelry industry. These stones are vital tools for gemologists, ensuring consistent color comparison and grading of diamonds and other precious gemstones. The set typically includes diamonds of known color grades, which are used to evaluate the color of stones being graded. By comparing a diamond or gemstone against the master stones under controlled lighting conditions, a gemologist can accurately assign a color grade, which plays a significant role in determining the stone's overall value. Master stones are meticulously selected and maintained to ensure they remain a reliable standard for color grading.