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86 Cards in this Set
- Front
- Back
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On an emerald-cut diamond, very narrow corners should be noted under
A.) Finish, a polishing detail B.) Finish, a symmetry variation C.) Proportions, as a shape-appeal factor D.) Proportions, as a length-to-width ratio variation |
C.) Proportions, as a shape appeal factor
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Where on a fancy-cut diamond might multiple facet reflections make it most difficult to detect clarity characteristics?
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Belly
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Calculate the length-to-width ratio of the following pear shape:
Length - 7.51mm Width - 5.19mm |
1.45:1
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Which of the following appears only on fancy cuts?
A.) Cutlet B.) Girdle C.) Keel Line D.) Upper Girdle Facets |
C.) Keel Line
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On a marquise-shaped, brilliant cut diamond, pavilion angle variations can result in
A.) A fisheye B.) A bow-tie C.) Pavilion bulge D.) Dark areas under the points |
B.) A bow-tie
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On emerald cuts, differences in the angles of the rows of pavilion facets cause
A.) Wide corners B.) Pavilion bulge C.) A bow-tie effect D.) A shortened cutlet |
B.) Pavilion Bulge
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Compared to round brilliants, what is one difference in the color grading process for a fancy-cut diamond?
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Viewing Direction
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Princess cuts are popular in jewelry designs that call for
A.) Curved lines B.) Pave settings C.) An antique look D.) Channel settings |
D.) Channel Settings
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What is the rounded end of a pear-shaped stone called?
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Wing
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Excessive pavilion bulge on emerald cuts results in
A.) Excess weight B.) Increased beauty C.) Fewer setting problems D.) Unattractive length-to-width ratio |
A.) Excess weight
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What are the slightly curved, central areas on the sides of some brilliant fancy-cuts called?
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Lobes
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How do you calculate the table percentage of a fancy cut diamond?
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Divide the width of the table by the width of the stone
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When you judge a diamond's shape appeal, you consider
A.) Its bulge factor B.) Its total depth percentage C.) The symmetry of its corresponding parts D.) Whether or not its shape is graceful and pleasing |
D.) Whether or not its shape is graceful and pleasing
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What's considered under symmetry when grading a pear-shaped diamond?
A.) Flat head B.) Bulging wings C.) High shoulders D.) Cutlet placement |
D.) Cutlet placement
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What is a faceting style that replaces large bezel facets at the point of some diamonds with star and upper girdle facets called?
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French Tip
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The slightly curving center of a long side of a pear, marquise, heart, or oval.
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Belly
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A dark area across the center of an elongated brilliant cut.
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Bow-tie
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A cutting style in which triangular and kite-shaped facets radiate from a gem's center toward its girdle.
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Brilliant Cut
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The arrangement of a gem's facets
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Cutting style
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Any gemstone shape other than round
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Fancy cut
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A faceting style that replaces the large bezel facets at the points of marquises, pears, and hearts with star and upper girdle facets
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French tips
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A numerical expression of the relationship between the length and width of a fancy cut, where the value for the width is one.
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Length-to-width ratio
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A cutting style that combines step-cut and brilliant-cut facets
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Mixed cut
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Outward curve of the pavilion facets of a step-cut diamond
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Pavilion bulge
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The face-up outline of a gem
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Shape
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A diamond's overall attractiveness in relation to others of the same shape and cutting style
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Shape Appeal
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A cutting style with long, narrow, four sided facets in rows parallel to the girdle on both the crown and pavilion
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Step-cut
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Diamonds that can be repolished to improve their clarity to VVS1 or VVS2 grade
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Improvables
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Diamonds that can be repolished to improve their clarity to an internally flawless grade
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Potentials
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Repairing damage or refashioning a polished diamond to improve its clarity, proportions, or color, or to modernize an old-style cut
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Recutting
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Refinishing a polished diamond to correct minor faults in its clarity or finish
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Repolishing
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A mounting makes it impossible to
A.) Appraise a diamond B.) Accurately weigh a diamond C.) Estimate a diamond's proportions D.) Locate a diamond's clarity characteristics |
B.) Accurately weigh a diamond
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How do you see a diamond's clarity characteristics that might be hidden by prongs?
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Use reflections
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How do you color grade a mounted diamond?
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Hold its table beside the masterstone's table without letting the stones touch
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Accurate weight estimation of a mounted diamond requires
A.) A computer imaging system B.) Very little skill or experience C.) Careful measurements and a calculator D.) Making adjustments for proportion variations |
D.) Making adjustments for proportion variations
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What requires the greatest adjustment to estimated weight?
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Thick Girdle
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What is the ultimate recutting consideration?
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The potential value of the finished diamond
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What is a diamond's recut style largely determined by?
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Its original cut
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Calculate the estimated weight of a round brilliant with the following dimensions:
Average diameter - 7.25mm Depth - 5.45mm Girdle Thickness - Very Thick |
1.83ct.
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Calculate the estimated weight of a heart-shaped brilliant with the following dimensions:
Length - 5.58mm Width - 5.51mm Depth - 3.21mm Girdle Thickness - Medium |
0.58ct.
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What is the adjustment factor to use when estimating the weight of an emerald-cut diamond with the following dimensions?
Length - 8.4mm Width - 5.59mm Depth - 2.85mm |
0.0092
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What two factors do you need to find the crown height percentage?
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Crown angle & table percentage
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Which setting makes it most difficult to estimate a stone's weight?
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Bezel with a closed back
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Where does the chart of weight adjustment factors begin to apply?
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Slightly Thick
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A diamond grading system provides
A.) Exact diamond market value to a buyer B.) A consistent way to communicate diamond quality C.) Assurance to customers that they're getting the best prices D.) Diamond descriptions that can change from country to country |
B.) A consistent way to communicate diamond quality
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Who is a wholesaler?
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Some who sells to retailers
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Diamond prices on wholesale price lists
A.) Are not negotiable B.) Reflect a worldwide consensus C.) Are available free on the internet D.) Depend on the market conditions that exist when the lists are published |
D.) Depend on the market conditions that exist when the lists are published
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Large, high-quality diamonds are
A.) sorted rather than graded B.) Usually graded in their mountings C.) Graded with a quick look under a loupe D.) Graded much more thoroughly than small, low-quality ones |
D.) Graded much more thoroughly than small, low-quality ones
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Diamond's supreme hardness and durability are
A.) Due to diamond's rarity B.) A result of the conditions under which it formed C.) Surpassed by laboratory-grown diamond substitutes D.) A result of millions of years of battery by the forces of nature |
B.) A result of the conditions under which it formed
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Once diamond deposits are located, mining companies
A.) Begin extracting the diamonds B.) Recover the cost of exploration within the first year C.) Are exempt from taxes and environmental regulations D.) Must spend additional time and money to evaluate and develop them |
D.) Must spend additional time and money to evaluate and develop them
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What is an estimation of the value of an article?
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Appraisal
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What are the most consistent and dependable sources of diamond grades?
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Reputable gemological laboratories
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Substantial price discounts are available to retailers and jewelry manufacturers who
A.) Travel to diamond mines B.) Can buy in large quantities C.) Buy small quantities every month D.) Always buy from the same supplier |
B.) Can buy in large quantities
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A diamond's clarity and color grades indicate its
A.) Quality B.) Popularity C.) Retail Price D.) Wholesale Price |
A.) Quality
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Why don't reputable gemological laboratories grade mounted diamonds?
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Mountings hide details of clarity and cut
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How do dealers sort melee?
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Sieves
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Why has the diamond industry changed dramatically in recent years?
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The world's supply of diamond rough has increased
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The Argyle Mine in Australia contributed to
A.) an economic slowdown in Australia B.) The rise of the cutting industry in India C.) The decline of production in South Africa D.) The rise of the cutting industry in Australia |
D.) The rise of the cutting industry in Australia
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Who are wholesale price lists organized?
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Specific combinations of the Four C's
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Who were the two major diamond producers before the discover of South Africa's diamond deposits?
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India and Brazil
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When did diamond sources start appear in South Africa?
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During the 1860s
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Who was the Central Selling Organisation?
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A rough diamond distribution agency
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What sparked the South African diamond rush?
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The Discovery of the Star of South Africa
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What is the soft, diamond-bearing material near the surface of a diamond field?
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Yellowground
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Who was Cecil Rhodes' main competitor in his early attempts to control diamond production?
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Ernest Oppenheimer
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Who established De Beers Consolidated Mines Ltd. in 1888?
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Cecil Rhodes
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What was De Beers Consolidated Mines Ltd. named after?
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The district where the Star of South Africa was found
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Who was the group that united in 1890 to buy and sell all of the output of the major diamond producers, including De Beers?
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London Diamond Syndicate
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What was Oppenheimer's answer to low diamond demand in the 1930s?
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Shut down operations at De Beers mines
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Why was the Diamond Information Center and the Diamond Promotion Service created?
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To Assist in diamond marketing efforts
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What the paths called that diamonds follow from mine to consumer?
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Diamond pipeline
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Sightholders purchase diamond rough by
A.) Going directly to the mines B.) Attending invitation-only trading events C.) Selecting from lists sent out by De Beers D.) Contacting other sighthoders in their area |
B.) Attending invitation-only trading events
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What does De Beers require of its sightholders?
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Excellent reputation in the industry and the financial strength to make large purchase commitments
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What does the word "specials" refer to in the diamond trade?
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Diamond rough over 10.80cts.
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An agency designed to purchase, sort, evaluate, and sell rough diamonds
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Central Selling Organisation (CSO)
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An independent diamond prospector
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Digger
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A prospector's term for diamond deposits away from water
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Dry diggings
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A group of diamond merchants that united in 1890 to buy and sell rough diamonds
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London Diamond Syndicate
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The path diamonds followed from the mine to the consumer
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Diamond pipeline
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Trading event where selected clients buy diamonds
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Sight
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A diamond manufacturer or dealer invited by De Beers to buy rough diamonds
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Sightholder
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A direct, centrally controlled marketing route for rough diamonds
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Single-channel marketing
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A rough diamond over 10.80cts., sold separately to a sightholder who specializes in larger stones
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Special
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Which diamond mine's huge production influenced the world market in the late 1980s?
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Argyle
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What is the commitment to reserve a portion of the resources derived from any country for the economic development of that country called?
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Benefication
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What is a city, region, or country with a large number of gemstone manufacturers called?
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Cutting Center
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