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?
- Color intensity
- Cut quality
- Carat weight
- Clarity characteristics (correct)
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?
- To increase the stone's brilliance
- To avoid weight loss from expensive rough (correct)
- To improve the stone's clarity grade
- To make the stone more durable
What determines the influence of clarity characteristics on a stone's marketability?
What determines the influence of clarity characteristics on a stone's marketability?
- Brilliance, fire, and durability
- Nature, size, number, position, and relief (correct)
- Shape, size, color, and clarity
- Cut quality, carat weight, color intensity, and clarity
What is the highest colored stone clarity grade?
What is the highest colored stone clarity grade?
What is an important skill for a successful stone buyer?
What is an important skill for a successful stone buyer?
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?
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?
What is a damaged area on a gem, usually near the girdle?
What is a damaged area on a gem, usually near the girdle?
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?
Which of the following inclusions is typically found in groups?
Which of the following inclusions is typically found in groups?
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?
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?
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?
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?
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?
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?
What is a group of needle-like inclusions ?
What is a group of needle-like inclusions ?
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 ?
Tiny parallel grooves on a facet surface left by the polishing operation?
Tiny parallel grooves on a facet surface left by the polishing operation?
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..... ?
A fingerprint inclusion is ....?
A fingerprint inclusion is ....?
A contrast between a inclusion and its host gem is ..?
A contrast between a inclusion and its host gem is ..?
A general term for a break in a gem is ....?
A general term for a break in a gem is ....?
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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