Determining the Ruby Red

While diamonds stand for brilliance, colored gemstones stand for color. Sometimes it may seem more complicated than this because there are several factors than the primary color that help us determine a gemstone’s value. At times, it may seem difficult to distinguish between two similar looking gemstones. The primary reason is that gemstone colors are a combination of hue, tone and deep saturation. Hue, simplified, refers to the first impression of a gemstone's color. Tone expresses the degree of darkness (or lightness) of color. Saturation, on the other hand, tells us about the intensity of color (I.e. Deep and dark vivid red).
Ruby to the general public may seem just as a red stone, but when seen closely or magnified, we can see the definitions that determine the right ruby for you. Red is the primary hue seen in rubies, accompanied by secondary hues such as slight orange, strong orange, slight purple and strong purple. Deep red is considered to be the most ideal. After you have judged the basic color of the stone, next we consider the tone and saturation. The spectrum of tones is divided into very dark, dark, medium, light to very light. Medium is considered the best color, followed by dark. Then, we have saturation. Saturation is most commonly referred to as color purity. The concentration of hue ranges from vivid to weak, vivid being the best. Although, deep saturation is a positive feature, when the gemstone has an excessively blackish tint, the gemstone becomes undesirable. Thus where tone and saturation is important, your first consideration should be given to color. Therefore, the premium ruby quality is vivid red in a medium to medium dark tone.
While hue, tone and saturation are important considerations, when we add facets to our list, determining the ruby value presents a challenge. For instance, tone seems straightforward, but not when it is unevenly distributed and varies by facet. Additionally, differentiating between medium to medium dark tones may be difficult. We encourage questions, but sometimes it’s best if you leave it to trained gemological experts at Angara.

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Author : Ankit Daga