GIA COLORED STONES STUDY EXAMS QUESTIONS
AND ANSWERS SURE A+
✔✔For effective clarity enhancement, the material used to fill a gem's fractures must
have nearly the same - ✔✔refractive index as the gem.
✔✔After irradiation, which gem's color is stable under normal wearing conditions ? -
✔✔Golden beryl
✔✔Jadeite is often - ✔✔bleached and polymer impregnated.
✔✔The Zachery method is a treatment applied to - ✔✔turquoise
✔✔Heat treatment in a reducing environment - ✔✔deepens blue color in sapphire.
✔✔Quartz or topaz with a thin layer of gold deposited on the surface is known as -
✔✔aqua aura.
✔✔Treaters use sugar treatment to enhance - ✔✔opal.
✔✔What is Myanmar's most important gem export ? - ✔✔Ruby
,✔✔Which location produces the majority of rubies that end up in mass-produced jewelry
? - ✔✔Mong Hsu
✔✔Which trade term describes a mixture of gem qualities that represents unsorted
production from a particular mine ? - ✔✔Mine run
✔✔Which term describes a specific rough gemstone quality range, usually determined
by color, size, clarity, and price ? - ✔✔Grade
✔✔Where is rough from Mogok brought into Thailand ? - ✔✔Mae Sot
✔✔Where is rough from Mong Hsu brought into Thailand ? - ✔✔Mae Sai
✔✔In mining terms, the theft of a mine's production by its workers is known as - ✔✔high
grading.
✔✔Which of the following is a quantity of stones, sometimes of similar size and quality,
from a single mine or from many different sources ? - ✔✔Parcel
✔✔Which of these is a cutting center for colored stones in Thailand ? - ✔✔Chantaburi
✔✔Materials cut free-size are usually - ✔✔large, important stones.
✔✔Gemstone sizes cut to fit standard mountings are known as - ✔✔calibrated sizes
✔✔The market sector where better-quality gemstones are used in well-finished,
moderately priced jewelry is known as the - ✔✔middle market.
✔✔Which term describes a random sample from a parcel of gemstones, often used to
assess the parcel's overall quality ? - ✔✔Pick
✔✔Which of the following is a price for buying an entire parcel of gems, or a substantial
part of it ? - ✔✔Lot price
✔✔Which of the following is a premium price for selecting stones from a parcel ? -
✔✔Pick price
✔✔Which gemstone occurs in almost every color ? - ✔✔Tourmaline
✔✔The first impression of an object's basic color is its - ✔✔hue.
✔✔Generally, cool-colored hues with low saturation look - ✔✔grayish.
, ✔✔Use trade terms that imply geographic origin only if the - ✔✔gem's actual source is
known.
✔✔Which trade term describes certain tourmalines ? - ✔✔"Paraiba"
✔✔Which abbreviations does the GIA Colored Stone Grading System use for a slightly
purplish red hue ? - ✔✔slpR
✔✔In practice, what GIA Colored Stone Grading tone levels apply to grading
transparent colored stones ? - ✔✔2 through 6
✔✔A see-through area in a transparent gemstone's body color that usually results from
the way the gem was cut is called - ✔✔a window.
✔✔A window usually differs from the rest of the stone in - ✔✔saturation.
✔✔Extinction results from - ✔✔deep pavilions.
✔✔The color of the background for grading a colored stone should be - ✔✔neutral.
✔✔What type of lighting is best for grading color in a colored stone ? - ✔✔Daylight-
equivalent fluorescent
✔✔Higher levels of saturation are usually found in stones with - ✔✔medium to medium-
dark tone.
✔✔What two coloring agents are usually responsible for color change in gemstones ? -
✔✔Chromium and vanadium
✔✔Emission of visible light by a material when it's exposed to invisible ultraviolet
radiation is - ✔✔fluorescence.
✔✔Which type of rough is usually faceted ? - ✔✔Transparent
✔✔To retain as much weight as possible from rare, high-quality rough, cutters would
most likely vary - ✔✔proportions.
✔✔Removing heavily included sections from gemstone rough by carefully tapping it with
a small hammer is known as - ✔✔cobbing.
✔✔Rough that's ground to the approximate shape of the finished stone is called -
✔✔preform.
AND ANSWERS SURE A+
✔✔For effective clarity enhancement, the material used to fill a gem's fractures must
have nearly the same - ✔✔refractive index as the gem.
✔✔After irradiation, which gem's color is stable under normal wearing conditions ? -
✔✔Golden beryl
✔✔Jadeite is often - ✔✔bleached and polymer impregnated.
✔✔The Zachery method is a treatment applied to - ✔✔turquoise
✔✔Heat treatment in a reducing environment - ✔✔deepens blue color in sapphire.
✔✔Quartz or topaz with a thin layer of gold deposited on the surface is known as -
✔✔aqua aura.
✔✔Treaters use sugar treatment to enhance - ✔✔opal.
✔✔What is Myanmar's most important gem export ? - ✔✔Ruby
,✔✔Which location produces the majority of rubies that end up in mass-produced jewelry
? - ✔✔Mong Hsu
✔✔Which trade term describes a mixture of gem qualities that represents unsorted
production from a particular mine ? - ✔✔Mine run
✔✔Which term describes a specific rough gemstone quality range, usually determined
by color, size, clarity, and price ? - ✔✔Grade
✔✔Where is rough from Mogok brought into Thailand ? - ✔✔Mae Sot
✔✔Where is rough from Mong Hsu brought into Thailand ? - ✔✔Mae Sai
✔✔In mining terms, the theft of a mine's production by its workers is known as - ✔✔high
grading.
✔✔Which of the following is a quantity of stones, sometimes of similar size and quality,
from a single mine or from many different sources ? - ✔✔Parcel
✔✔Which of these is a cutting center for colored stones in Thailand ? - ✔✔Chantaburi
✔✔Materials cut free-size are usually - ✔✔large, important stones.
✔✔Gemstone sizes cut to fit standard mountings are known as - ✔✔calibrated sizes
✔✔The market sector where better-quality gemstones are used in well-finished,
moderately priced jewelry is known as the - ✔✔middle market.
✔✔Which term describes a random sample from a parcel of gemstones, often used to
assess the parcel's overall quality ? - ✔✔Pick
✔✔Which of the following is a price for buying an entire parcel of gems, or a substantial
part of it ? - ✔✔Lot price
✔✔Which of the following is a premium price for selecting stones from a parcel ? -
✔✔Pick price
✔✔Which gemstone occurs in almost every color ? - ✔✔Tourmaline
✔✔The first impression of an object's basic color is its - ✔✔hue.
✔✔Generally, cool-colored hues with low saturation look - ✔✔grayish.
, ✔✔Use trade terms that imply geographic origin only if the - ✔✔gem's actual source is
known.
✔✔Which trade term describes certain tourmalines ? - ✔✔"Paraiba"
✔✔Which abbreviations does the GIA Colored Stone Grading System use for a slightly
purplish red hue ? - ✔✔slpR
✔✔In practice, what GIA Colored Stone Grading tone levels apply to grading
transparent colored stones ? - ✔✔2 through 6
✔✔A see-through area in a transparent gemstone's body color that usually results from
the way the gem was cut is called - ✔✔a window.
✔✔A window usually differs from the rest of the stone in - ✔✔saturation.
✔✔Extinction results from - ✔✔deep pavilions.
✔✔The color of the background for grading a colored stone should be - ✔✔neutral.
✔✔What type of lighting is best for grading color in a colored stone ? - ✔✔Daylight-
equivalent fluorescent
✔✔Higher levels of saturation are usually found in stones with - ✔✔medium to medium-
dark tone.
✔✔What two coloring agents are usually responsible for color change in gemstones ? -
✔✔Chromium and vanadium
✔✔Emission of visible light by a material when it's exposed to invisible ultraviolet
radiation is - ✔✔fluorescence.
✔✔Which type of rough is usually faceted ? - ✔✔Transparent
✔✔To retain as much weight as possible from rare, high-quality rough, cutters would
most likely vary - ✔✔proportions.
✔✔Removing heavily included sections from gemstone rough by carefully tapping it with
a small hammer is known as - ✔✔cobbing.
✔✔Rough that's ground to the approximate shape of the finished stone is called -
✔✔preform.
