GIA COLORED STONE FINAL EXAM QUESTIONS AND CORRECT
ANSWERS |2026/2027 UPDATED |GUARANTEED PASS.
The color of a sorting pad should be. Assignment 11 - Answer -neutral
Individual stone prices are referred to as. Assignment 11 - Answer -unit prices
The international unit of measurement for gem weight is the. Assignment 11 - Answer -metric
carat
If a parcel of amethysts contains 1,000 stones and weighs a total of 1,542.00 cts. with a per-
carat price of $0.75, what is the unit price? Assignment 11 - Answer -1.16
What category of colored stone is often sold per piece? Assignment 11 - Answer -Small,
inexpensive
Colored stones with higher values usually have. Assignments 11 - Answer -medium to medium-
dark tone and vivid saturation.
Heat treating Mong Hsu rubies. Assignment 12 - Answer -eliminates dark centers or cores.
1|Page
,The most valuable tone and saturation for ruby are. Assignment 12 - Answer -medium to
medium-dark tone and vivid saturation.
Corundum can only form in an environment that is low in. Assignment 12 - Answer -Silicon
The most common crystal habit for ruby is the. Assignment 12 - Answer -tabular hexagonal
prism
Never describe a stone by a source name unless. Assignment 12 - Answer -you're sure the stone
came from that source
The flame-fusion method for creating synthetic rubies is also known as. Assignment 12 - Answer
-the Verneuil method
Ruby deposits in Thailand and Cambodia are associated with. Assignment 12 - Answer -alkali-
basalt.
Ruby's major cutting, treatment, and wholesale trading center is - Answer -Thailand
The rubies found in the mountains of Tajikistan, Afghanistan, and Pakistan are all. Assignment
12 - Answer -marble-hosted
2|Page
,By the beginning of 2010, which area had emerged as the world's most important ruby source?
Assignment 12 - Answer -Montepuez in northern Mozambique
Rubies that come from marble deposits are typically low in. Assignment 12 - Answer -iron
Types of clarity enhancement in ruby include oiling and. Assignment 12 - Answer -glass filling
Which of the following have inclusions and growth structures that might closely resemble
natural rubies? Assignment 12 - Answer -Flux and hydrothermal synthetics
What location supplied most of the world's commercial-quality rubies through the 1990s?
Assignment 12 - Answer -Myanmar
Ruby can command the highest per-carat price of all colored stones, especially when it's.
Assignment 12 - Answer -untreated.
Blue sapphire's most common crystal habit is a(n). Assignment 13 - Answer -spindle-shaped
hexagonal pyramid or bipyramid.
3|Page
, What trace elements cause blue sapphire's color? Assignment 13 - Answer -Titanium and iron
Blue sapphires that originate in basaltic rock generally have. Assignment 13 - Answer -high iron
content
Which of the following sources emerged in the 1990s as a significant source of good- to fine-
quality sapphire? Assignment 13 - Answer -Madagascar
The most highly valued blue sapphire hues are. Assignment 13 - Answer -blue to violetish blue.
Australian sapphire's blue color is often described as. Assignment 13 - Answer -Inky
Milky, grayish, or brownish corundum that can be treated to a fine blue color is called.
Assignment 13 - Answer -geuda
When trade members use the single word "sapphire," they are referring to. Assignment 13 -
Answer -the blue variety of corundum
4|Page
ANSWERS |2026/2027 UPDATED |GUARANTEED PASS.
The color of a sorting pad should be. Assignment 11 - Answer -neutral
Individual stone prices are referred to as. Assignment 11 - Answer -unit prices
The international unit of measurement for gem weight is the. Assignment 11 - Answer -metric
carat
If a parcel of amethysts contains 1,000 stones and weighs a total of 1,542.00 cts. with a per-
carat price of $0.75, what is the unit price? Assignment 11 - Answer -1.16
What category of colored stone is often sold per piece? Assignment 11 - Answer -Small,
inexpensive
Colored stones with higher values usually have. Assignments 11 - Answer -medium to medium-
dark tone and vivid saturation.
Heat treating Mong Hsu rubies. Assignment 12 - Answer -eliminates dark centers or cores.
1|Page
,The most valuable tone and saturation for ruby are. Assignment 12 - Answer -medium to
medium-dark tone and vivid saturation.
Corundum can only form in an environment that is low in. Assignment 12 - Answer -Silicon
The most common crystal habit for ruby is the. Assignment 12 - Answer -tabular hexagonal
prism
Never describe a stone by a source name unless. Assignment 12 - Answer -you're sure the stone
came from that source
The flame-fusion method for creating synthetic rubies is also known as. Assignment 12 - Answer
-the Verneuil method
Ruby deposits in Thailand and Cambodia are associated with. Assignment 12 - Answer -alkali-
basalt.
Ruby's major cutting, treatment, and wholesale trading center is - Answer -Thailand
The rubies found in the mountains of Tajikistan, Afghanistan, and Pakistan are all. Assignment
12 - Answer -marble-hosted
2|Page
,By the beginning of 2010, which area had emerged as the world's most important ruby source?
Assignment 12 - Answer -Montepuez in northern Mozambique
Rubies that come from marble deposits are typically low in. Assignment 12 - Answer -iron
Types of clarity enhancement in ruby include oiling and. Assignment 12 - Answer -glass filling
Which of the following have inclusions and growth structures that might closely resemble
natural rubies? Assignment 12 - Answer -Flux and hydrothermal synthetics
What location supplied most of the world's commercial-quality rubies through the 1990s?
Assignment 12 - Answer -Myanmar
Ruby can command the highest per-carat price of all colored stones, especially when it's.
Assignment 12 - Answer -untreated.
Blue sapphire's most common crystal habit is a(n). Assignment 13 - Answer -spindle-shaped
hexagonal pyramid or bipyramid.
3|Page
, What trace elements cause blue sapphire's color? Assignment 13 - Answer -Titanium and iron
Blue sapphires that originate in basaltic rock generally have. Assignment 13 - Answer -high iron
content
Which of the following sources emerged in the 1990s as a significant source of good- to fine-
quality sapphire? Assignment 13 - Answer -Madagascar
The most highly valued blue sapphire hues are. Assignment 13 - Answer -blue to violetish blue.
Australian sapphire's blue color is often described as. Assignment 13 - Answer -Inky
Milky, grayish, or brownish corundum that can be treated to a fine blue color is called.
Assignment 13 - Answer -geuda
When trade members use the single word "sapphire," they are referring to. Assignment 13 -
Answer -the blue variety of corundum
4|Page
