An Intro to Gemstone Color
From ruby to sapphire and emerald to blue topaz, the color of a gemstone is the most defining feature of any piece of jewelry—in fact, around 60 percent of the value of a gemstone is based on its color alone.
What are Hue, Tone and Saturation?
When it comes to the many unique and beautiful colors of gemstones, there’s more than meets the eye. While we may assign more value to one color over another based on our personal taste in jewelry, three scientific factors—hue, tone and saturation—determine the true value of a gemstone based on its color. Hue is what we generally associate as color. Tone is how light or dark. Saturation is how rich or vivid.
The Hue of a Gemstone
The hue of the gemstone refers to the color itself. For example, the ruby is most known for its pink and red hues, and emeralds are best known for their greenish and yellowish hues. In most cases, gemstones have a primary and a secondary hue, but when weighing the value of the gemstone’s color, experts often search for stones that are as free from secondary colors as possible. In general, the most valuable gemstones exhibit a pure color and only slight hues of others. Exceptions include the opal, which is a unique gemstone that increases in value when there are more visible colors throughout.
The Tone of a Gemstone
The tone of a gemstone’s color refers to the depth of the color, from dark to light. When categorizing a gemstone’s tone, experts use the following terms to describe the range in its opacity: light, medium-light, medium, medium dark and dark. To evaluate the value of a gemstone based on its tone, we recommend holding it under a table or away from any direct light. This technique allows you to more easily determine the tone of a gemstone, since a brighter stone will still have life and brilliance, even when light isn’t directly shining on it.
The Saturation of a Gemstone
The saturation of a gemstone refers to the intensity of its color, ranging from light to strong to vivid. The more vivid the gemstone, the more valuable it is. For example, the value of an emerald gemstone is largely dependent on how green the stone is, and the price may drop significantly when the color begins to approach a more “mossy” shade of green.
What To Look For When Buying a Gemstone
The best gemstone for you is the one that draws you in and fits your aesthetic, personality and style. Gemstones have a variety of characteristics that differentiate them from others, including:
ColorGemstone color is, perhaps, its most important quality. Some gemstones have beautiful primary and secondary colors to them that many people love, even though these may not be the most valuable stones. Still, the most important thing to consider when you’re buying a gemstone for jewelry is how well you like the color. If a mossy-colored emerald makes you happy, there is no reason you shouldn’t choose one over a more valuable, greener green.
BrillianceA gemstone’s brilliance is how bright it looks when you and the gemstone are stationary. Brilliance is the result of how much light is reflected by the stone and the contrast pattern dictated by the cut.
ScintillationA combination of brilliance and scintillation is what gives a gemstone its sparkle, or liveliness. Determining how scintillating a gemstone is requires either the gemstone or the viewer being in motion.
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