1
Q
- The color of blue zircon is usually
A. natural.
B. due to irradiation.
C. due to heat treatment.
D. due to irradiation followed by heating.
A
due to heat treatment.
2
Q
- The cause of color in peridot is
A. iron.
B. nickel.
C. vanadium.
D. chromium.
A
iron
3
Q
- Which characteristic easily distinguishes colorless zircon from diamond and synthetic cubic zirconia?
A. Fire
B. Heft
C. Brilliance
D. Strong doubling
A
Strong doubling
4
Q
- Paraíba tourmaline is colored by
A. iron.
B. cobalt.
C. copper.
D. chromium.
A
copper
5
Q
- Which countries produce the finest peridot?
A. Myanmar and Pakistan
B. Madagascar and Sri Lanka
C. Afghanistan and Cambodia
D. The United States and Brazil
A
Myanmar and Pakistan
6
Q
- What is peridot’s rating on the Mohs scale?
A. 2 to 3
B. 5 to 5.5
C. 6.5 to 7
D. 9
A
6.5 to 7
6
Q
- For the most part, rubellite tourmaline is colored by
A. iron.
B. copper.
C. chromium.
D. manganese.
A
manganese
7
Q
- Most gem tourmalines form in
A. marble.
B. limestone.
C. pegmatites.
D. metamorphic rock.
A
pegmatites
8
Q
- Metamict zircons are described as
A. low zircons.
B. high zircons.
C. normal zircons.
D. diffusion-treated zircons.
A
low zircons
9
Q
1.Most fine chrome tourmaline comes from Kenya and
A. Brazil.
B. Tanzania.
C. Sri Lanka.
D. Madagascar.
A
Tanzania
10
Q
- The most expensive variety of tourmaline is
A. Paraíba.
B. chrome.
C. rubellite.
D. indicolite.
A
Paraiba
11
Q
- Which of the following trade terms is used for blue tourmaline?
A. Chrome
B. Rubellite
C. Verdelite
D. Indicolite
A
Indicolite
12
Q
- The world’s largest producer of gem-quality tourmaline is
A. Brazil.
B. Zambia.
C. Tanzania.
D. Madagascar.
A
Brazil
13
Q
- Most gem tourmalines are
A. uvite.
B. schorl.
C. elbaite.
D. dravite.
A
elbaite
14
Q
- Many green and blue tourmalines are lightened by
A. heating.
B. bleaching.
C. irradiation.
D. irradiation followed by heating.
A
heating
