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FREE SCIENCE AND STUDY GAMES ABOUT GIA COLORED
STONES EXAM QUESTIONS
Qs and Ans Expert- Explanation
This Exam contains:
-Guarantee passing score -408 Questions and Answers -format set of multiple-choice -Expert- Explanation
Question 1: Asterism in black star sapphire is caused by
- tubes.
- hematite.
- twinning planes.
- copper platelets.
Answer:
- Hematite
Question 2: A snakeskin structural pattern is typical of
- synthetic opal.
- imitation lapis lazuli.
- flame-fusion synthetics.
- hydrothermal synthetic quartz.
Answer:
- Synthetic opal
Question 3: Which treatment can create a golden color from black coral?
- Coating
- Heating
- Bleaching
- Irradiation
Answer:
- Bleaching
- diffraction.
- interference.
- single refraction.
- double refraction.
Question 4: When a gem's crystal structure splits light into two rays that each travel at a slightly different speed and direction, it's called
Answer:
- Double Refraction
- Iron
- Cobalt
- Vanadium
- Chromium
Question 5: Which transition element causes a greater variety of gem colors than any other?
Answer:
- Iron
Question 6: A number of similar cultured pearl strands bundled together is called a
- hank.
- mabé.
- bushel.
- pearl sac.
Answer:
- Hank
- refraction.
- dispersion.
- pleochroism.
- absorption spectrum.
Question 7: The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope is called
Answer:
- Absorption Spectrum
Question 8: The adularescence of the finest moonstones is
- blue.
- green.
- purple.
- yellow.
Answer:
- Blue
Question 9: The world's largest gem-consuming market is
- Japan.
- Europe.
- Thailand.
- United States
Answer:
- United States
- Brazil.
- Russia.
- Burma.
- Zambia.
Question 10: In the nineteenth century, a major source of amethyst was discovered in
Answer:
- Brazil
Question 11: Most opal formed
- 15 to 30 thousand years ago.
- 150 to 300 thousand years ago.
- 15 to 30 million years ago.
- 150 to 300 million years ago.
Answer:
- 15 to 30 million years ago
Question 12: What is the only type of gem that can show pleochroism?
- Faceted
- Phenomenal
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