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Rubies are gemstones that are more expensive than most others. They are one of the most important gems in the colored stone market. There are a few important factors considered when assigning natural ruby grades. These include color, clarity, inclusions, and transparency. The cut and weight are also reviewed, and sometimes the origin of the ruby can affect its grade as well.
With this system, rubies can be graded according to different ranks. The categories of this grading system include AAA, AA, A, and B qualities. Above you can see a ruby color chart with the different grading ranks labeled under each stone.
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The name ruby is derived from the Latin word “ruber,” which means red. When determining the quality of ruby based on its color, the hue, saturation, and tone must always be taken into account. Hue is important because it refers to the basic color of rubies. For example, different hues include red, slight orange, strong orange, slight purple, and strong purple. If a ruby has a red hue, that is considered to be ideal. Saturation is what gives ruby its color purity and intensity. It’s the extent to which the hue is masked by brown or gray. The color saturation categories include vivid, strong, fair, medium, and weak. The highest quality rubies always have vivid color saturation. Finally, the tone refers to how much color is in a ruby gemstone. Its ranges include very dark, dark, medium, light, very light. A medium tone is ideal for rubies.
The clarity in rubies refers to how many inclusions it has. Here are some in-depth clarity grades that can determine the overall clarity of natural rubies.
Rubies that are graded as VVS and VS are considered to be the highest qualities.
There are many different kinds of inclusions that are found in rubies. An inclusion is any characteristic that is found inside the stone. Inclusions are natural. Here are common inclusions that are found in natural rubies.
The degree of visibility through natural rubies is referred to as transparency. It’s a quality that is often overlooked when discussing rubies. The categories of transparency include transparent, semi-transparent, translucent, semi-translucent/semi-opaque, and opaque. Transparent rubies have excellent brilliance regardless of any inclusions that they might have. Objects always look clear and distinct through the stone. With semi-transparent rubies, objects appear slightly blurry through the stone. Translucent rubies make objects hard to see. Light can pass through, but it’s slightly diffused. Semi-translucent rubies have a small fraction of light that can pass through the gemstone. Finally, with opaque rubies, almost no light can pass through the stone. Having a transparent ruby is considered ideal, and it’s the highest quality.
The most common treatment for a natural ruby is heat treatment. Rubies are heated to improve their clarity and color. Temperatures more than 1,700 degrees Celsius are used to dissolve silk and improve the overall clarity and color. This can affect their grade and make them higher-quality and more appealing.
Overall, natural rubies are amazing gemstones. They follow a similar process of grading that other gemstones do. Their color, clarity, inclusions, transparency, and treatment are taken into consideration when determining their quality and grade.
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