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Diamonds and Diamond Grading Final EXAM | MOST RECENT EXAM 2026-2027 ACTUAL COMPLETE MOST TESTED REAL EXAM QUESTIONS AND VERIFIED SOLUTIONS | GET IT 100% ACCURATE!! ALREADY GRADED A+!! NEWEST EXAM | JUST RELEASED!!
A city region or country with a large number of gemstone manufacturers is called a - ANSWER -Cutting center
In 2000, De Beers altered is consumer advertising by - ANSWER -Introducing the "Forevermark" Logo
Which diamond mine's huge production influenced the world market in the late 1980s - ANSWER - Argyle
The diamond industry program designed to ensure that diamonds do not fund civil conflict or terrorism is called - ANSWER -The Kimberley Process
In South Africa, a new mining charter that designates the peopke of the country as the owners of its mineral resources is a result of - ANSWER – Black Economic Empowerment
One of the changes that resulted from De Beers' strategic review in 1999 was that De Beers - ANSWER -Changed the name of the CSO to the DTC
How far beneath the earth's surface do diamonds form? - ANSWER -90 to 140 miles
Scientists have found that diamonds form in two types of rocks, called - ANSWER -Peridotite and eclogite
Diamond is hard and graphite is soft because of the difference in - ANSWER - The way their atoms fit together
Most of the world's kimberlite pipes - ANSWER -Do not contain diamonds in
Octahedral planes
Crystal shape is an important factor in the evaluation of rough because - ANSWER -It affects the amount of weight retained after cutting
Which is the softest crystal direction in diamond - ANSWER - Dodecahedral
The strongest of all atomic bonds are called - ANSWER - Covalent
Atoms in a gem that aren't part of its essential chemical composition are called - ANSWER -Trace elements
Squares or rectangles, trigons, and parallel grooves are types of - ANSWER - Growth marks
A flat, triangular twinned diamond crystal is called a - ANSWER -Macle
Solid matter with atom arranged in a regular, repeating pattern is called a(n) -
ANSWER –
Crystal
During emplacement, if diamonds are exposed to high temps along with decreased pressure for a long periods, they will.. - ANSWER -Convert to graphite
Diamond rough suitable for us in tools, drills, and abrasives is - ANSWER - Industrial quality
A mine's potential profitability depends in part on - ANSWER - Its ore grade
A profitable mine - ANSWER -Produces diamonds whose value is higher than the mine's operating costs
Indicator minerals in kimberlite and lamproite include tiny - ANSWER - Diamonds
Diamonds are more concentrated in - ANSWER -Marine deposits Diamond deposits found at the ocean's shore are - ANSWER - Marine deposits
Industrial diamonds
For more than 2000 years, the only known diamond sources were - ANSWER - Alluvial
The Argyle mine is famous for diamonds that are - ANSWER - Pink
Dirt and clay are washed from diamond bearing ore by - ANSWER -Scrubbers
Most modern diamond mining operations are - ANSWER - Large in scale and extremely expensive
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
Because the Australians believed the CSO's marketing favored large stones over smaller ones, they - ANSWER -Aggressively promoted jewelry set with
their own tiny gems
The involvement of a business or industry in all aspects of its product's market is called - ANSWER -Vertical integration
The most common impurity element found in diamonds is - ANSWER -Nitrogen
When a gem absorbs some wavelengths of light and transmits others, the process is called - ANSWER -Selective absorption
Type IIB diamonds contain - ANSWER -Boron
Which of the following diamonds colors would be the most valuable, all other factors being equal - ANSWER -Red
A noticeable "oily" appearance seen in some diamond is usually the result of - ANSWER -Very strong fluorescence
The most common colored diamond color is - ANSWER -Brown
diamond - ANSWER - metallic flux
Scientists succeeded in producing synthetic industrial diamonds for the first time in the - ANSWER - 1950s
Annealed diamond color can change if it's exposed to - ANSWER -heat during routine repairs
which one of the following is typical of the UV fluorescence of lab-grown diamonds - ANSWER -yellow to greenish yellow under both longwave and shortwave
GIA Laboratory and other gemological laboratories - ANSWER -don't grade fracture-filled diamonds
which one of the following is used today to safely color treat diamonds - ANSWER -high energy electrons in a linear accelerator
laser drill holes - ANSWER -become permanent clarity characteristics
most lab-grown gem-quality diamonds are - ANSWER -yellow or brown
the origin of a diamond's color - ANSWER -should usually be determined by a gemological laboratory
If a diamond weighs 1.83 cts. and its price is $13,725, what is its per-carat price? - ANSWER - $
the main reason that dealers charge less when diamonds are paid for immediately is that - ANSWER -dealers usually borrow money to finance their own purchases
A grooved, white, non-reflective tray is used to - ANSWER -match sets of stones
Published wholesale diamond price lists are - ANSWER - estimates of wholesale prices in a given market at a certain time
A knowledgeable, experienced, and successful diamond dealer or manufacturer
inspect stones before buying
A rapid and efficient way to sort large numbers of small, round diamonds is to use a(n) - ANSWER - sieve set
when you buy an entire parcel you can expect to pay a - ANSWER -lot price
if a diamond weighs 0.76 cts and the per-carat prices is $ how much does the diamond cost - ANSWER -$
you should expect to pay more when you buy from a dealer
A structural defect that influences a gem's absorption of light is called a(n) - ANSWER -Color center
Diamonds were delivered to the Earth's surface as recently as
million years ago
The correct conditions for diamond formation exist under - ANSWER -Cratons The large, stable parts of the earth's continental crust are called - ANSWER - Cratons
The proper environment for diamond formation includes the right temperatrues, pressure and - ANSWER -The availability of carbon
Before arriving at the earth's surface, diamonds might remain in the mantle for as long as a few - ANSWER -Hundred million years
A loupe used for clarity grading must be corrected for chromatic and - ANSWER -Spherical distortion
Large, high-quality diamonds are... - ANSWER -Graded much more thoroughly than small, low- quality ones
The most consistent and dependable sources of diamond grades are... - ANSWER -Reputable gemological labs
A surface indentation with tiny, root-like feathers penetrating the stone is called a - ANSWER - Bruise
A term used to describe any break within a diamond is - ANSWER -Feather
In most cases the easier it is to see a clarity characteristic, the - ANSWER - Lower the clarity grade
Inclusions are usually most visible when they're located - ANSWER -Directly under the table
One factor used to determine the clarity grade of a diamond is an inclusions - ANSWER - Location
A feather that reaches a bezel surface as well as the surface of the pavilion main directly under that bezel - ANSWER -Should be plotted on both the crown and the pavilion diagram
A stone with only a few extra facets on its pavilion that can't be seen face-up should be graded - ANSWER - Flawless
The designated SI means - ANSWER -Slightly included
VS1 and VS2 stones might have - ANSWER -Minor included crystals and feathers
The more an inclusion differs in color from tis host diamond
- ANSWER -The more obvious it is
Which of these would disqualify a stone from being graded IF - ANSWER - Pinpoint
Inclusions and blemishes that establish the clarity grade of a diamond are collectively called - ANSWER -Grade-setting characteristics
A common method of permanently changing the color of a diamond is - ANSWER - Irradiating
When boron is present in a diamond's crystal structure, it colors the diamond - ANSWER - Blue
The relative lightness or darkness of a color is called its - ANSWER -Tone
A loose brown diamond should be color graded - ANSWER - Against a yellow master stone set
A maser stone graded as whole grade represents the - ANSWER -Least amount of color possible in that grade's range
Which of the following GIA color grades indicates the greatest amount of yellow
J
The basic face up color of a colored diamond is known as its - ANSWER - Characteristic color
The diamonds used as comparison stones for color grading are called - ANSWER -Master stones
Which of the following makes a diamond unsuitable for a masterstone set - ANSWER -Very strong fluorescence
Trade terms that describe diamond color - ANSWER -Can be misleading
Colorless diamonds are more valuable than others in the normal color range because they - ANSWER -Are more rare
If a diamond has a slight tint in the face down position and appears colorless in the face up position its estimated color grade would be - ANSWER -G,H,I and
