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GIA Diamonds and Diamond Grading Final Exam
Substantial price discounts are available to retailers and jewelry manufacturers who - ANSWER-can buy in large quantities.
The diamond industry has changed dramatically in recent years because - ANSWER-the world's supply of diamond rough has increased.
A diamond grading system provides - ANSWER-a consistent way to communicate diamond quality.
Diamond's supreme hardness and durability are - ANSWER-a result of the conditions under which it formed.
Wholesale price lists are usually organized according to - ANSWER-specific combinations of the Four Cs.
An estimation of the value of an article is a(n) - ANSWER-appraisal
The most consistent and dependable sources of diamond grades are - ANSWER- reputable gemological laboratories.
A diamond's clarity and color grades indicate its - ANSWER-quality
Once diamond deposits are located, mining companies - ANSWER-must spend additional time and money to evaluate and develop them.
Large, high-quality diamonds are - ANSWER-graded much more thoroughly than small, low-quality ones.
Reputable gem laboratories don't grade mounted diamonds because - ANSWER- mountings hide details of clarity and cut.
The group that united in 1890 to buy and sell all of the output of the major diamond producers, including De Beers, was the - ANSWER-London Diamond Syndicate
Oppenheimer's answer to low diamond demand in the 1930s was to - ANSWER- shut down operations at De Beers mines.
In the diamond trade, the word "specials" refers to - ANSWER-diamond rough over 10.80 cts.
The Central Selling Organisation was a - ANSWER-rough diamond distribution agency.
The South African diamond rush was sparked by - ANSWER-the discovery of the Star of South Africa.
Diamond sources started appearing in South Africa during the - ANSWER- 1860's
The path diamonds followed from mine to consumer was called the - ANSWER- diamond pipeline.
The Diamond Information Center and the Diamond Promotion Service were created to - ANSWER-assist in diamond marketing efforts.
The soft, diamond-bearing material near the surface of a diamond field was named - ANSWER-yellowground.
De Beers Consolidated Mines Ltd. was named after - ANSWER-the owners of a farm where one of the first diamond rushes took place.
Who established De Beers Consolidated Mines Ltd. in 1888? - ANSWER-Cecil Rhodes
De Beers requires its sightholders to have an excellent reputation in the industry and - ANSWER-the financial strength to make large purchase commitments.
Which diamond mine's huge production influenced the world market in the late 1980s? - ANSWER-Argyle
A city, region, or country with a large number of gemstone manufacturers is called a - ANSWER-Cutting Center
In 2000, De Beers altered its consumer advertising by - ANSWER-introducing the "Forevermark" logo.
The diamond industry program designed to ensure that diamonds do not fund civil conflict or terrorism is called - ANSWER-The kimberley process
The involvement of a business or industry in all aspects of its product's market is called - ANSWER-vertical integration.
By 2004, more than 90 percent of manufacturing for the diamond market was done in - ANSWER-India
The program adopted by De Beers in 2007 to answer critics and resolve
shortcomings of its SOC program is called - ANSWER-Supplier of Choice 2.
Businesses that sell to consumers via television cable, phone line, or satellite are called - ANSWER-electronic retailers.
Most of the world's kimberlite pipes - ANSWER-do not contain diamonds in profitable quantities.
The proper environment for diamond formation includes the right temperature, pressure and - ANSWER-the availability of carbon.
Scientists have found that diamonds form in two types of rocks, called - ANSWER- peridotite and eclogite.
Subduction occurs when - ANSWER-two of the earth's crustal plates collide.
During emplacement, if diamonds are exposed to high temperature along with decreased pressure for a long period, they will - ANSWER-convert to graphite.
Diamond is hard and graphite is soft because of the difference in - ANSWER-the way their atoms fit together.
The three main components of the earth are the crust, mantle, and - ANSWER- Core
How far beneath the earth's surface do diamonds form? - ANSWER-90 to 140 miles (140 to 220 kilometers)
Only a small percentage of known diamond deposits are mined because most - ANSWER-Are not profitable
Diamond deposits found at the ocean's shore are - ANSWER-marine deposits.
Diamonds are more concentrated in - ANSWER-marine deposits
Most of the diamonds mined today come from - ANSWER-pipes
The first step in exploring for diamonds is to - ANSWER-look for the oldest parts of the earth's crust.
Diamond rough suitable for use in jewelry is called - ANSWER-cuttable
A mine's potential profitability depends in part on - ANSWER-its ore grade.
Diamond rough suitable for use in tools, drills, and abrasives is - ANSWER- industrial quality.
The concentration of diamonds within a pipe is called - ANSWER-ore grade
For more than 2,000 years, the only known diamond sources were - ANSWER- alluvial
Indicator minerals in kimberlite and lamproite include tiny - ANSWER-diamonds
A profitable mine - ANSWER-produces diamonds whose value is higher than the mine's operating costs.
Diamonds classified as cuttable can be 100 times more valuable than - ANSWER- industrial diamonds
A horizontal tunnel drilled through a diamond pipe is called a - ANSWER-drift
Russia's significant diamond deposits are in - ANSWER-Siberia
The shift in emphasis from alluvial to primary diamond mining was due to - ANSWER-Improved Technology
Most modern diamond-mining operations are - ANSWER-large in scale and extremely expensive.
Chambering and block caving are methods used in - ANSWER-mining diamond pipes.
Russia's diamond sources are almost all - ANSWER-Alluvial
Most diamonds from Australia are - ANSWER-small and poor in quality.
African diamonds are recovered from - ANSWER-pipe, alluvial, and marine deposits.
The largest percentage of world diamond production (by weight) is mined in - ANSWER-Australia.
Solid matter with atoms arranged in a regular, repeating pattern is called a(n) - ANSWER-crystal
The crystal planes most suitable for cleaving a diamond are the - ANSWER- cubic planes
The diamond term glassie refers to - ANSWER-a well-formed octahedral crystal.
A flat, triangular twinned diamond crystal is called a - ANSWER-macle
Atoms in a gem that aren't part of its essential chemical composition are called
Another name for the cubic crystal system is - ANSWER-isometric
In diamonds, cleavage is caused by - ANSWER-relatively wide spaces between some atomic planes.
The flashes of light and the contrasting dark areas you see when the diamond, the light, or the observer moves are called - ANSWER-scintillation.
The difference between the RI values of specific violet and red wavelengths of visible light for a given material is its - ANSWER-dispersion
The higher the optical density of a material, the - ANSWER-more it slows light down.
The angle of incidence always equals the - ANSWER-angle of reflection.
Visible light is - ANSWER-a form of radiant energy.
Variations in lighting and surroundings can affect a diamond's - ANSWER- appearance
The appearance of a material's surface in reflected light is called - ANSWER- luster
Grease on the pavilion of a diamond results in - ANSWER-more light leakage through the pavilion
White light is actually - ANSWER-a combination of all the spectral colors.
The passage of light into or through a material is called - ANSWER-transmission
In order to exit a diamond, light must strike an inner surface - ANSWER-inside the critical angle
The flashes of color you see in a polished diamond are called - ANSWER-fire
The relative size, arrangement, and contrast of bright and dark areas that result from a diamond's internal and external reflections is called - ANSWER-pattern
When the rough has a frosty or non-transparent surface, the cutter can look for inclusions by - ANSWER-polishing a window to view the interior.
The cast-iron disc on which a diamond is polished is called a - ANSWER-scaife
The person who decides where to mark diamond rough for fashioning is called the
A diamond cutter's main objectives are to produce an attractive finished diamond and - ANSWER-maximize profits
The number of facets on a single-cut diamond is - ANSWER-17 or 18
The devices that grip and hold a diamond for polishing are known as the - ANSWER-dop and tang
A notch scratched into diamond rough to prepare it for cleaving is called a - ANSWER-kerf
To help determine crystal directions, diamond cutters look for - ANSWER- growth marks
The rotary saw contributed to the diamond cutting industry by - ANSWER- allowing for greater weight retention from rough.
The process of polishing the star and upper and lower half facets is called - ANSWER-brillianteering
The size of a finished gem depends greatly upon the rough diamond's - ANSWER- shape
Which of the following is not a diamond inclusion? - ANSWER-Gas Bubble
A solid mineral body enclosed within a diamond (or other gem) is - ANSWER-an included crystal.
A loupe used for clarity grading must be corrected for chromatic and - ANSWER- spherical distortion.
