Podcast
Questions and Answers
What is the factor play a significant role in the value of a colored stone?
What is the factor play a significant role in the value of a colored stone?
Why do cutters often leave cavities in less noticeable areas of a stone?
Why do cutters often leave cavities in less noticeable areas of a stone?
What determines the influence of clarity characteristics on a stone's marketability?
What determines the influence of clarity characteristics on a stone's marketability?
What is the highest colored stone clarity grade?
What is the highest colored stone clarity grade?
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What is an important skill for a successful stone buyer?
What is an important skill for a successful stone buyer?
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What type of inclusion is a hollow tube that might be filled with liquid or gas?
What type of inclusion is a hollow tube that might be filled with liquid or gas?
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What is a characteristic or irregularity confined to the surface of a polished gemstone?
What is a characteristic or irregularity confined to the surface of a polished gemstone?
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What is a damaged area on a gem, usually near the girdle?
What is a damaged area on a gem, usually near the girdle?
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What is the primary purpose of a cutter leaving cavities in certain areas of a stone?
What is the primary purpose of a cutter leaving cavities in certain areas of a stone?
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Which of the following inclusions is typically found in groups?
Which of the following inclusions is typically found in groups?
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What is the term for the ability to judge a gem's quality with the unaided eye?
What is the term for the ability to judge a gem's quality with the unaided eye?
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Why are some types of colored stones assessed according to different clarity standards?
Why are some types of colored stones assessed according to different clarity standards?
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What is the term for tiny nicks and pits caused by wear and damage to a gem's facet edges or culet?
What is the term for tiny nicks and pits caused by wear and damage to a gem's facet edges or culet?
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What is the term for an angular, hollow space within a gem that resembles a mineral inclusion?
What is the term for an angular, hollow space within a gem that resembles a mineral inclusion?
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When examining expensive stones, what is recommended to use in addition to the unaided eye?
When examining expensive stones, what is recommended to use in addition to the unaided eye?
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What is the term for a mineral crystal trapped within a gem as it grows?
What is the term for a mineral crystal trapped within a gem as it grows?
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What is a group of needle-like inclusions ?
What is a group of needle-like inclusions ?
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A linear scrape, normally seen as a fine curved or straight white line ?
A linear scrape, normally seen as a fine curved or straight white line ?
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Tiny parallel grooves on a facet surface left by the polishing operation?
Tiny parallel grooves on a facet surface left by the polishing operation?
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Any hazy or milky area that cannot be described as feather, fingerprint, or group of included crystals or needles is a..... ?
Any hazy or milky area that cannot be described as feather, fingerprint, or group of included crystals or needles is a..... ?
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A fingerprint inclusion is ....?
A fingerprint inclusion is ....?
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A contrast between a inclusion and its host gem is ..?
A contrast between a inclusion and its host gem is ..?
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A general term for a break in a gem is ....?
A general term for a break in a gem is ....?
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Study Notes
Clarity Characteristics
- Clarity characteristics that affect transparency, brilliance, or durability have the most influence on value.
- Five factors determine the influence of clarity characteristics on marketability: nature, size, number, position, and relief.
Clarity Grades
- Eye-clean is the highest colored stone clarity grade.
Gemstone Inclusions
- Abrasions: tiny nicks and pits caused by wear and damage to a gem's facet edges or culet.
- Included crystal: a mineral crystal trapped within a gem as it grows.
- Blemish: a characteristic or irregularity confined to the surface of a polished gemstone.
- Needle: a long, thin inclusion that can be a solid crystal or a hollow tube that might be filled with liquid or gas.
- Cavity: an opening that extends into a gem from the surface.
- Negative crystal: an angular, hollow space within a gem that resembles a mineral inclusion.
- Chip: a damaged area on a gem, usually near the girdle.
- Pinpoint: a minute inclusion enclosed within a gem; can occur singly or in groups called clouds.
Gemstone Buying
- A successful stone buyer should be able to quickly judge a gem's quality with the unaided eye.
- It's essential to examine expensive stones carefully with a loupe.
- Some types of colored stones are typically more included than others, so they're assessed according to different clarity standards.
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