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1. Gemstone that occurs in almost every color Tourmaline
2. The first impression of an object's basic col- Hue
or
3. Generally how cool-colored stones with low Grayish
saturation look
4. The cutter's main goal Produce a stone with the highest possible
value
5. Variations in conditions and coloring agents Color Zoning
that occur during crystal growth can result
in
6. When a singly refractive stone shows a sec- Light reflected within the stone interacts
ond color face-up, this is because with light transmitted though it
7. For consistency, you should view colored Daylight-equivalent fluorescent
stones under this type lighting whenever
possible
8. Before looking at the color of a gem, clean Neutrally colored
the stone, and then pick it up by its girdle
with tweezers or place it on a background
that is
9. In general, attractive colored stones tend to Medium to Medium-Dark tone
have highly saturated hues and
10.
, GIA Colored Stones {GEM} - Actual Exam Questions With
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Most defects in colored stone proportions Compromises made by the cutter to pro-
are duce economically viable gems
11. Use trade terms that imply geographic ori- The gem's actual source is known
gin only if
12. Which abbreviation does the GIA Colored slpR
Stone Grading System use for slightly pur-
plish red hue?
13. In practice, what GIA Colored Stone Grad-
ing tone levels apply to transparent colored 2 through 8
stones?
14. Extinction results from Deep pavilions
15. What two coloring agents are usually re- Chromium and Vanadium
sponsible for color change in gemstones?
16. To retain as much weight as possible from
rare, high-quality rough, cutter would most Proportions
likely vary
17. Removing heavily included sections from
Cobbing
gemstone rough by carefully tapping it with
a small hammer is known as
18. Translucent to opaque rough is often cut Cabochon
into a
19. A carved design that projects slightly from a Cameo
flat or curved surface is called