Podcast
Questions and Answers
What is the minimum age requirement for tree resin to be considered amber?
What is the minimum age requirement for tree resin to be considered amber?
Where is the most valuable coral primarily marketed?
Where is the most valuable coral primarily marketed?
What is a characteristic of amber that makes it unique?
What is a characteristic of amber that makes it unique?
Why is the trade of new elephant ivory heavily restricted?
Why is the trade of new elephant ivory heavily restricted?
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What type of coral is characterized by its intense red color?
What type of coral is characterized by its intense red color?
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What is the term for circular marks left in amber when it is heated and oiled?
What is the term for circular marks left in amber when it is heated and oiled?
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What are the two basic types of coral ?
What are the two basic types of coral ?
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What are the regions are the principal sources of Amber?
What are the regions are the principal sources of Amber?
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Study Notes
Colored Stones
- Many sources of organic gem materials are endangered and protected by environmental laws.
Coral
- The most valuable red coral is an intense red, referred to as "oxblood" by dealers.
- Italy is the most important coral-marketing center, so many coral color terms are Italian.
- There are two basic types of gem coral: calcareous coral and conchiolin coral.
Amber
- To be called amber, tree resin must harden over time and be at least a million years old.
- The Baltic Sea region and the Dominican Republic are the principal sources of amber.
- Amber is known for its preserved insects and other inclusions.
- Sun spangles are circular marks sometimes left in amber when treaters heat and oil it.
Elephant Ivory
- Almost all trade in new elephant ivory has been illegal since the mid-1970s.
Jet
- Jet was popular as mourning jewelry in the late Victorian era.
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Description
This quiz covers various concepts and characteristics of colored stones, including organic gem materials, red coral, and amber.
