By what date had Kokichi Mikimoto begun culturing whole pearls️️1908
Synthetic gem materials️️Are not minerals
which of the following is an organic gem️️amber
which of the following is amorphous️️amber
a natural material that's made up of a mass of one or more kinds of mineral c...
GIA Colored Stone Final Exam with comprehensive questions and
answers 2024/2025
By what date had Kokichi Mikimoto begun culturing whole pearls✔️✔️1908
Synthetic gem materials✔️✔️Are not minerals
which of the following is an organic gem✔️✔️amber
which of the following is amorphous✔️✔️amber
a natural material that's made up of a mass of one or more kinds of mineral crystals is✔️✔️rock
what group does alamandine belong to✔️✔️garnet
A gem produced by, or derived from, a living organism is✔️✔️organic
which of the following is a gem variety✔️✔️demantoid
the world's largest gem-consuming market is✔️✔️the US
a substance that consists of atoms of only one kind is a✔️✔️chemical element
Media attention in the 1990s regarding its treatment reduced consumer confidence in✔️✔️emerald
a natural, inorganic substance with a characteristic chemical composition and usual crystal
structure is a✔️✔️mineral
,most gems are✔️✔️minerals
To be a gem, a mineral must be beautiful, durable, and✔️✔️rare
a broad gem category based on chemical composition and crystal structure is called a✔️✔️gem
species
Many colored stones are mined by✔️✔️independent miners using small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are✔️✔️metamorphic
Which type of deposit is usually the most profitable for colored stone mining?✔️✔️secondary
Which gem can crystallize in volcanic rock from gasses released by magma?✔️✔️red beryl
Emeralds are rarely found in placer deposits because they're✔️✔️unable to withstand much
abrasion
Which is a workable alluvial deposit of gem minerals with economic potential?✔️✔️placers
Which is a deposit where gems eroded from the source rock and remained in place
nearby?✔️✔️eluvial
from granite, pegmatite gems get exotic elements like✔️✔️beryllium, boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by✔️✔️metamorphic process
most of the gems in tanzania's umba river valley are formed in✔️✔️placer deposits
,A deposit where gems are found in the rock that where they formed is called✔️✔️primary deposit
Which is a key locality for hydrothermal gems?✔️✔️Ouro Preto, Brazil
Heat and pressure transform limestone into✔️✔️marble
which gem form by metamophosis✔️✔️tanzanite
Most gemstones form in the✔️✔️continental crust
kunzite is most often associated with✔️✔️tourmaline and beryl in pegmatites
how heavy an object is in relation to its size✔️✔️density
A two-phase inclusion is a cavity in a gem that's typically filled with a✔️✔️liquid and a gas
which type of twinning is caused by environmental change after a gem forms✔️✔️polysynthetic
which element caused red in ruby and green in emerald✔️✔️chromium
A unit cell defines a mineral's✔️✔️basic identity
which type of twinning looks as if two crystal halves are mirror images✔️✔️contact twinning
crystals that grow in a flux that is highly saturated with the necessary elements tend to be -
✔️✔️small
, which is classified in the orthorhombic crystal system✔️✔️topaz
Which gems are cryptocrystalline aggregates?✔️✔️Chalcedony and turquoise
Atoms in a gem that aren't part of its essential chemical composition are called✔️✔️trace elements
Many fashioned rubies have shallow proportions because they're cut from✔️✔️flattened crystals
Rough spinel often occurs as✔️✔️twinned crystals
Needles of actinolite found in emerald are classified as✔️✔️inclusions
which aggregates crystals are visible only under very high magnification✔️✔️cryptocrystalline
the trace elements that cause corundum's blue are✔️✔️iron and titanium
what element does chromium substitute for to cause ruby's red✔️✔️aluminium
In many blue sapphires, the intervalence charge transfer that causes the color is between✔️✔️iron
and titanium
The pattern of dark vertical lines or bands shown by certain gems when viewed through a
spectroscope is called✔️✔️absorption spectrum
the process where electrons that selectively absorb light are passed back and forth between
neighboring impurity ions is known as✔️✔️charge transfer
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