GEM 220 COLORED STONES ASSIGNMENT 8
QUESTIONS AND CORRECT ANSWERS.
Before looking at the color of a gem, clean the stone, and then pick it up by its girdle with tweezers or
place it on a background that is ANSWER : -neutrally colored
Generally, cool-colored stones with low saturation look ANSWER : -grayish
For consistency, you should view colored stones under what type of lighting whenever possible?
ANSWER : -Daylight-equivalent fluorescent
Extinction results from ANSWER : -deep pavilions
Which abbreviation does the GIA Colored Stone Grading System use for a slightly purplish red hue?
ANSWER : -slpR
Use trade terms that imply geographic origin only if the ANSWER : -gem's actual source is known.
Which gemstone occurs in almost every color? ANSWER : -Tourmaline
What two coloring agents are usually responsible for color change in gemstones? ANSWER : -Chromium
and vanadium
The cutter's main goal is to ANSWER : -produce a stone with the highest possible value.
When a singly refractive stone shows a second color face-up, this is ANSWER : -because light reflected
within the stone interacts with light transmitted through it.
The first impression of an object's basic color is its ANSWER : -hue
QUESTIONS AND CORRECT ANSWERS.
Before looking at the color of a gem, clean the stone, and then pick it up by its girdle with tweezers or
place it on a background that is ANSWER : -neutrally colored
Generally, cool-colored stones with low saturation look ANSWER : -grayish
For consistency, you should view colored stones under what type of lighting whenever possible?
ANSWER : -Daylight-equivalent fluorescent
Extinction results from ANSWER : -deep pavilions
Which abbreviation does the GIA Colored Stone Grading System use for a slightly purplish red hue?
ANSWER : -slpR
Use trade terms that imply geographic origin only if the ANSWER : -gem's actual source is known.
Which gemstone occurs in almost every color? ANSWER : -Tourmaline
What two coloring agents are usually responsible for color change in gemstones? ANSWER : -Chromium
and vanadium
The cutter's main goal is to ANSWER : -produce a stone with the highest possible value.
When a singly refractive stone shows a second color face-up, this is ANSWER : -because light reflected
within the stone interacts with light transmitted through it.
The first impression of an object's basic color is its ANSWER : -hue
