Questions and Answers
What is the most important factor to consider when judging a gemstone's beauty and value?
Why is it crucial to know a gem's identity before grading it?
What is generally more valued in gemstone varieties?
Why should you avoid using trade terms that imply a gem's geographic origin?
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How can the way a gem is cut affect its appearance?
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Why do cutters often compromise on proportions when cutting highly valuable rough?
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What can be a result of cutting compromises that save weight?
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Why do larger stones tend to appear more saturated than smaller stones?
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What is the main goal of the cutter when cutting a gemstone?
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Why do some gemstone species only reach fine color in large sizes?
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When comparing gemstones, why is it important to compare them within their own species or variety?
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What is the purpose of using comparison stones or color samples when buying gemstones?
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Why are consistent procedures important when grading colored stones?
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What is the relationship between a gem's tone and its saturation level?
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Why do some gemstones appear more saturated when cut into larger stones?
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What is the consequence of cutting compromises that save weight?
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What is the reason for cutters to compromise on proportions when cutting valuable rough?
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Why do some gemstone species share similar hue and saturation ranges?
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What is the main goal of the cutter when cutting a gemstone?
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Why do some gemstones only reach fine color in large sizes?
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Study Notes
Evaluating Colored Stones
- Judge a gemstone's beauty and value by comparing it to others of the same species or variety.
- Use comparison stones or color samples when you can't control the lighting conditions.
Grading Colored Stones
- Know a gem's identity before grading it.
- Consistent procedures are crucial when grading colored stones.
- Pure hues are generally more valued than mixed hues in many gemstone varieties.
Characteristics of Attractive Colored Stones
- Attractive colored stones tend to have highly saturated hues and medium to medium-dark tone.
- Hues with very light or very dark tone usually don't reach the same high levels of saturation as those with medium tone.
The Impact of Cutting on Colored Stones
- The way a gem is cut can dramatically affect its face-up color.
- Larger stones can appear more saturated than smaller stones cut from the same rough.
- The cutter's main goal is to produce a stone with the highest possible value.
Cutting Compromises
- Cutters often compromise on proportions to save weight and avoid loss of money when rough is very valuable.
- Cutting compromises can cause extinction, windows, or both.
- Many defects in colored stone proportions are compromises made by the cutter to produce economically viable gems.
Size and Color in Colored Stones
- Some stones reach fine color only in large sizes, while others only in small sizes.
- Larger stones can appear more saturated than smaller stones cut from the same rough.
Shared Hue and Saturation Ranges
- Many gemstone species share some of the same hue and saturation ranges.
Evaluating Colored Stones
- Judge a gemstone's beauty and value by comparing it to others of the same species or variety.
- Use comparison stones or color samples when you can't control the lighting conditions.
Grading Colored Stones
- Know a gem's identity before grading it.
- Consistent procedures are crucial when grading colored stones.
- Pure hues are generally more valued than mixed hues in many gemstone varieties.
Characteristics of Attractive Colored Stones
- Attractive colored stones tend to have highly saturated hues and medium to medium-dark tone.
- Hues with very light or very dark tone usually don't reach the same high levels of saturation as those with medium tone.
The Impact of Cutting on Colored Stones
- The way a gem is cut can dramatically affect its face-up color.
- Larger stones can appear more saturated than smaller stones cut from the same rough.
- The cutter's main goal is to produce a stone with the highest possible value.
Cutting Compromises
- Cutters often compromise on proportions to save weight and avoid loss of money when rough is very valuable.
- Cutting compromises can cause extinction, windows, or both.
- Many defects in colored stone proportions are compromises made by the cutter to produce economically viable gems.
Size and Color in Colored Stones
- Some stones reach fine color only in large sizes, while others only in small sizes.
- Larger stones can appear more saturated than smaller stones cut from the same rough.
Shared Hue and Saturation Ranges
- Many gemstone species share some of the same hue and saturation ranges.
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Description
This quiz tests your knowledge of colored stones, including their beauty, value, and grading. Learn how to judge a gemstone's quality and identify its species.
