COLORED STONES FINAL EXAM UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

COLORED STONES FINAL EXAM UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
Velvety blue to violetish blue, in medium to mediumdark tones, with strong to vivid saturation
Answer:
Fine sapphire

Question:
What trace elements cause the blue of sapphire?
Answer:
Iron and titanium

Question:
A smokey corundum that turns blue when treated
Answer:
Dhun

Question:
Higher levels of iron make basalt-hosted sapphires ______ than non-basaltic saphhires.
Answer:
Darker

Question:
What is the trade name cosidered as the finest blue sapphire?
Answer:
Kashmir

Question:
A common sapphire characteristic
Answer:
Color zoning

Question:
Most sapphires are ______ to improve their appearance.
Answer:
Heat treated

Question:
Fine quality, untreated sapphires make up ______ of the sapphire market.
Answer:
A small but extremely valuable segment

Question:
What country buys about half of the blue sapphires on the world market?

, Answer:
USA

Question:
Kashmir sapphires owe their reputation to a brief period of output during what time period?
Answer:
1880s

Question:
What country is a major center of the corrundum trade, funneling a steady flow of gems from worldwide
sources into the consumer market?
Answer:
Thailand

Question:
What country is the world's largest source of dark blue, commercial quality blue sapphires?
Answer:
Australia

Question:
What country has become a significant source of good to fine qualtiy blue sapphires?
Answer:
Madagascar

Question:
The most common sapphire synthesis method
Answer:
Flame fusion

Question:
Milky, greyish, or brownish corundum that can be treated to a fine blue color
Answer:
Geuda

Question:
Color of fine blue sapphire
Answer:
Blue to violetish blue

Question:
Blue sapphires that orginate in basaltic rock generally have a...
Answer:
Higher iron content

Question:
Finer quality Kashmir blue sapphires typically show what type of appearance?