GIA COLORED STONES EXAMINERS SET
QUESTIONS AND ANSWERS SURE A+
✔✔sapphire - ✔✔Tanzanite's attractive color makes this gem an alternative to _____.
✔✔centralized - ✔✔Compared to the diamond market, the colored stone market is less
_____.
✔✔Thailand - ✔✔Where is a world leader in corundum heat treatment?
✔✔jadeite - ✔✔China traditionally prizes fine _____.
✔✔emerald - ✔✔Negative media publicity concerning treatment disclosure harmed the
market for _____.
✔✔trade organization - ✔✔The American Gem Trade Association (AGTA) is a _____.
✔✔trade show locations - ✔✔Tucson, Arizona and Las Vegas, Nevada are two
important _____.
✔✔Burma - ✔✔Which country's name is associated with vibrant (fine-quality) red ruby?
, ✔✔ethics - ✔✔rules or standards governing personal or professional conduct
✔✔treatments - ✔✔any human-controlled process, beyond cutting and polishing, that
improves the appearance, durability, or value of a gem
✔✔disclosure - ✔✔clearly and accurately informing customers about the nature of the
goods they buy
✔✔bleaching - ✔✔a treatment that uses chemicals to lighten or remove color
✔✔cavity filling - ✔✔treatment that fills and seals voids to improve appearance and add
weight
✔✔colorless impregnation - ✔✔filling of pores or other openings with melted wax, resin,
polymer, or plastic to improve appearance and stability
✔✔dyeing - ✔✔a treatment that adds color or affects color by deepening it, making it
more even, or changing it
✔✔quench-crackling - ✔✔a rapid heating and cooling process that produces fractures
in a stone so it will accept dye
✔✔fracture filling - ✔✔using a filler to conceal fractures and improve the apparent clarity
of a gem
✔✔heat treatment - ✔✔exposing a gem to rising temperatures for the purpose of
changing its appearance
✔✔irradiation - ✔✔exposing a gem to radiation to change or improve its color
✔✔lattice diffusion - ✔✔exposing a gem to high temperatures and chemicals to allow
penetration of color-causing elements
✔✔sugar treatment - ✔✔soaking an opal in hot sugar solution and then in sulfuric acid
to darken it and bring out its play-of-color
✔✔smoke treatment - ✔✔heating a wrapped opal until smoke or ash penetrates its
surface to darken it and bring out its play-of-color
✔✔surface modification - ✔✔altering a gem's appearance by applying backing,
coatings, or coloring agents like paint
✔✔flame-fusion - ✔✔a process in which powdered chemicals are dropped through a
high-temperature flame onto a rotating pedestal to produce a synthetic crystal
QUESTIONS AND ANSWERS SURE A+
✔✔sapphire - ✔✔Tanzanite's attractive color makes this gem an alternative to _____.
✔✔centralized - ✔✔Compared to the diamond market, the colored stone market is less
_____.
✔✔Thailand - ✔✔Where is a world leader in corundum heat treatment?
✔✔jadeite - ✔✔China traditionally prizes fine _____.
✔✔emerald - ✔✔Negative media publicity concerning treatment disclosure harmed the
market for _____.
✔✔trade organization - ✔✔The American Gem Trade Association (AGTA) is a _____.
✔✔trade show locations - ✔✔Tucson, Arizona and Las Vegas, Nevada are two
important _____.
✔✔Burma - ✔✔Which country's name is associated with vibrant (fine-quality) red ruby?
, ✔✔ethics - ✔✔rules or standards governing personal or professional conduct
✔✔treatments - ✔✔any human-controlled process, beyond cutting and polishing, that
improves the appearance, durability, or value of a gem
✔✔disclosure - ✔✔clearly and accurately informing customers about the nature of the
goods they buy
✔✔bleaching - ✔✔a treatment that uses chemicals to lighten or remove color
✔✔cavity filling - ✔✔treatment that fills and seals voids to improve appearance and add
weight
✔✔colorless impregnation - ✔✔filling of pores or other openings with melted wax, resin,
polymer, or plastic to improve appearance and stability
✔✔dyeing - ✔✔a treatment that adds color or affects color by deepening it, making it
more even, or changing it
✔✔quench-crackling - ✔✔a rapid heating and cooling process that produces fractures
in a stone so it will accept dye
✔✔fracture filling - ✔✔using a filler to conceal fractures and improve the apparent clarity
of a gem
✔✔heat treatment - ✔✔exposing a gem to rising temperatures for the purpose of
changing its appearance
✔✔irradiation - ✔✔exposing a gem to radiation to change or improve its color
✔✔lattice diffusion - ✔✔exposing a gem to high temperatures and chemicals to allow
penetration of color-causing elements
✔✔sugar treatment - ✔✔soaking an opal in hot sugar solution and then in sulfuric acid
to darken it and bring out its play-of-color
✔✔smoke treatment - ✔✔heating a wrapped opal until smoke or ash penetrates its
surface to darken it and bring out its play-of-color
✔✔surface modification - ✔✔altering a gem's appearance by applying backing,
coatings, or coloring agents like paint
✔✔flame-fusion - ✔✔a process in which powdered chemicals are dropped through a
high-temperature flame onto a rotating pedestal to produce a synthetic crystal
