GIA Colored Stone Final Exam COMPREHENSIVE
QUESTIONS AND VERIFIED ANSWERS (2025) EXAM|
ALREADY GRADED A+2025/2026
tree resin hardened over time up to 1000 years - perfect answersamber
inmature amber - perfect answerscopal
most valuable amber - perfect answerstransparent red
cause amber color change over time - perfect answersoxidation
circular marks sometimes left in amber when heat and oil it - perfect answerssun spangles
coral most valuable color - perfect answersintense red
color of conchiolin coral - perfect answersblack and gold
most valuable ivory - perfect answerselephant tusks
ornamental form of lignite coal - perfect answersjet
major jet source - perfect answersEngland
A natural, inorganic substance with a characteristic chemical composition and usually characteristic
crystal structure is a(n) - perfect answersmineral
Which of the following is a gem variety - perfect answersdemantoid
A substance that consists of atoms of only one kind is a - perfect answersChemicals element
,A broad gem category based on chemical composition and crystal structure is a - perfect answersgem
species.
Kunzite is most often found in association with - perfect answerstourmaline and beryl in pegmatite.
Myanmar's famous Mogok ruby deposits were formed by - perfect answersmetamorphic processes.
Most of the gems in Tanzania's Umba River Valley are found in - perfect answersplacer deposits
From granite, pegmatite gems get exotic elements like - perfect answersberyllium, boron, and lithium.
Heat and pressure transform limestone into - perfect answersmarble
Which type of twinning looks as if two crystal halves are mirror images - perfect answersContact
Which type of twinning is caused by environmental change after the gem forms - perfect
answersPolysynthetic
A unit cell defines a mineral's - perfect answersbasic identity.
Which is classified in the orthorhombic crystal system - perfect
answerstopaz,iolite,tanzanite,chrysoberyl and peridot
Crystals that grow in a flux that is highly saturated with the necessary elements tend to be - perfect
answerssmall
How heavy an object is in relation to its size is called its - perfect answersdensity
Which element does chromium substitute for to cause ruby's red - perfect answersAluminum
, Which element causes the color of both almandine and peridot - perfect answersiron
Which components of a transition element's atoms can produce color in gems - perfect
answerselectrons
Adularescence is caused by - perfect answersscattering of light
Which phenomenon is a broad color flash - perfect answerslabradorescence
The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope
is called - perfect answersabsorption spectrum
The process where electrons that selectively absorb light are passed back and forth between
neighboring impurity ions is known as - perfect answerscharge transfer.
Which gem can show three pleochroic colors - perfect answersLike tanzanite and andalusite, iolite can
show three pleochroic colors.
Which process uses a heating unit that passes over a rotating solid rod of chemicals until it forms a
synthetic crystal? - perfect answersFloating zone
The two main types of processes for synthetic gem production are melt and - perfect answerssolution
A snakeskin structural pattern is typical of - perfect answerssynthetic opal.
Which synthetic process uses an autoclave - perfect answersHydrothermal growth
The flux used in the flux process is a solid material that, when molten, - perfect answersdissolves other
materials.
QUESTIONS AND VERIFIED ANSWERS (2025) EXAM|
ALREADY GRADED A+2025/2026
tree resin hardened over time up to 1000 years - perfect answersamber
inmature amber - perfect answerscopal
most valuable amber - perfect answerstransparent red
cause amber color change over time - perfect answersoxidation
circular marks sometimes left in amber when heat and oil it - perfect answerssun spangles
coral most valuable color - perfect answersintense red
color of conchiolin coral - perfect answersblack and gold
most valuable ivory - perfect answerselephant tusks
ornamental form of lignite coal - perfect answersjet
major jet source - perfect answersEngland
A natural, inorganic substance with a characteristic chemical composition and usually characteristic
crystal structure is a(n) - perfect answersmineral
Which of the following is a gem variety - perfect answersdemantoid
A substance that consists of atoms of only one kind is a - perfect answersChemicals element
,A broad gem category based on chemical composition and crystal structure is a - perfect answersgem
species.
Kunzite is most often found in association with - perfect answerstourmaline and beryl in pegmatite.
Myanmar's famous Mogok ruby deposits were formed by - perfect answersmetamorphic processes.
Most of the gems in Tanzania's Umba River Valley are found in - perfect answersplacer deposits
From granite, pegmatite gems get exotic elements like - perfect answersberyllium, boron, and lithium.
Heat and pressure transform limestone into - perfect answersmarble
Which type of twinning looks as if two crystal halves are mirror images - perfect answersContact
Which type of twinning is caused by environmental change after the gem forms - perfect
answersPolysynthetic
A unit cell defines a mineral's - perfect answersbasic identity.
Which is classified in the orthorhombic crystal system - perfect
answerstopaz,iolite,tanzanite,chrysoberyl and peridot
Crystals that grow in a flux that is highly saturated with the necessary elements tend to be - perfect
answerssmall
How heavy an object is in relation to its size is called its - perfect answersdensity
Which element does chromium substitute for to cause ruby's red - perfect answersAluminum
, Which element causes the color of both almandine and peridot - perfect answersiron
Which components of a transition element's atoms can produce color in gems - perfect
answerselectrons
Adularescence is caused by - perfect answersscattering of light
Which phenomenon is a broad color flash - perfect answerslabradorescence
The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope
is called - perfect answersabsorption spectrum
The process where electrons that selectively absorb light are passed back and forth between
neighboring impurity ions is known as - perfect answerscharge transfer.
Which gem can show three pleochroic colors - perfect answersLike tanzanite and andalusite, iolite can
show three pleochroic colors.
Which process uses a heating unit that passes over a rotating solid rod of chemicals until it forms a
synthetic crystal? - perfect answersFloating zone
The two main types of processes for synthetic gem production are melt and - perfect answerssolution
A snakeskin structural pattern is typical of - perfect answerssynthetic opal.
Which synthetic process uses an autoclave - perfect answersHydrothermal growth
The flux used in the flux process is a solid material that, when molten, - perfect answersdissolves other
materials.
