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GIA Colored Stone Final Exam| 394 Questions and Answers 100% Correct

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GIA Colored Stone Final Exam| 394 Questions and Answers 100% CorrectGIA Colored Stone Final Exam| 394 Questions and Answers 100% CorrectGIA Colored Stone Final Exam| 394 Questions and Answers 100% CorrectGIA Colored Stone Final Exam| 394 Questions and Answers 100% Correct By what date had Kokichi ...

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GIA Colored Stone Final Exam|
394 Questions and Answers
100% Correct
By what date had Kokichi Mikimoto begun culturing whole pearls - ANSWER - 1908


Synthetic gem materials - ANSWER - Are not minerals


which of the following is an organic gem - ANSWER - amber


which of the following is amorphous - ANSWER - amber


a natural material that's made up of a mass of one or more kinds of mineral crystals
is - ANSWER - rock


what group does alamandine belong to - ANSWER - garnet


a broad gem category based on chemical composition and crystal structure is called
a - ANSWER - gem species


Many colored stones are mined by - ANSWER - independent miners using small-
scale mining methods.


Rocks altered by heat and pressure beneath Earth's surface are - ANSWER -
metamorphic


A gem produced by, or derived from, a living organism is - ANSWER - organic


which of the following is a gem variety - ANSWER - demantoid

,the world's largest gem-consuming market is - ANSWER - the US


a substance that consists of atoms of only one kind is a - ANSWER - chemical
element


Media attention in the 1990s regarding its treatment reduced consumer confidence
in - ANSWER - emerald


a natural, inorganic substance with a characteristic chemical composition and usual
crystal structure is a - ANSWER - mineral


most gems are - ANSWER - minerals


To be a gem, a mineral must be beautiful, durable, and - ANSWER - rare


Which type of deposit is usually the most profitable for colored stone mining? -
ANSWER - secondary


Which gem can crystallize in volcanic rock from gasses released by magma? -
ANSWER - red beryl


Emeralds are rarely found in placer deposits because they're - ANSWER - unable to
withstand much abrasion


Which is a workable alluvial deposit of gem minerals with economic potential? -
ANSWER - placers


Which is a deposit where gems eroded from the source rock and remained in place
nearby? - ANSWER - eluvial


from granite, pegmatite gems get exotic elements like - ANSWER - beryllium, boron,
and lithium

,When a gem's crystal structure splits light into two rays that each travel at a slightly
different speed and direction, it's called - ANSWER - double refraction


what is the only type of gem that can show pleochroism - ANSWER - doubly
refractive gems


which transition element causes a greater variety of gem colors that any other -
ANSWER - iron


Myanmar's famous Mogok ruby deposits were formed by - ANSWER - metamorphic
process


most of the gems in tanzania's umba river valley are formed in - ANSWER - placer
deposits


A deposit where gems are found in the rock that where they formed is called -
ANSWER - primary deposit


Which is a key locality for hydrothermal gems? - ANSWER - Ouro Preto, Brazil


Heat and pressure transform limestone into - ANSWER - marble


which gem form by metamophosis - ANSWER - tanzanite


Most gemstones form in the - ANSWER - continental crust


kunzite is most often associated with - ANSWER - tourmaline and beryl in
pegmatites


how heavy an object is in relation to its size - ANSWER - density

, A two-phase inclusion is a cavity in a gem that's typically filled with a - ANSWER -
liquid and a gas


which type of twinning is caused by environmental change after a gem forms -
ANSWER - polysynthetic


which element caused red in ruby and green in emerald - ANSWER - chromium


A unit cell defines a mineral's - ANSWER - basic identity


which type of twinning looks as if two crystal halves are mirror images - ANSWER -
contact twinning


crystals that grow in a flux that is highly saturated with the necessary elements
tend to be - - ANSWER - small


which is classified in the orthorhombic crystal system - ANSWER - topaz


Which gems are cryptocrystalline aggregates? - ANSWER - Chalcedony and
turquoise


Atoms in a gem that aren't part of its essential chemical composition are called -
ANSWER - trace elements


Many fashioned rubies have shallow proportions because they're cut from - ANSWER
- flattened crystals


Rough spinel often occurs as - ANSWER - twinned crystals


Needles of actinolite found in emerald are classified as - ANSWER - inclusions

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