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Questions and Answers
What is the minimum age requirement for tree resin to be considered amber?
Where is the most valuable coral primarily marketed?
What is a characteristic of amber that makes it unique?
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?
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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 ?
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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.
