GIA Diamond Essentials Final Exam
2018 (Answered) Complete Verified Solution.
Updated 2024.
Crown
Top part of the gem above the girdle
Culet
Small facet at the bottom of a finished gem
Durability
A gemstone's ability to withstand wear, heat, and chemicals
Facet
A flat, polished surface on a finished gem
Fancy cut
Any gemstone shape or cutting style other than a standard round brilliant
Fire
The flashes of colour you see in a polished diamond
Four Cs
Four value factors (clarity, colour, cut, and carat weight) that describe the quality of a
finished gem and also relates primarily to its value
Girdle
The narrow section of a finished gem that forms the boundary between the crown and
the pavilion and functions as the gem's setting edge
Hardness
How well a gemstone resists scratches and abrasion
Inclusion
Clarity characteristic totally enclosed in a polished gemstone or extending into it from
the surface
Karat
A unit for the fineness of gold, abbreviated "K" or "Kt"
Metric carat
The international unit of measure for gram weight. One carat equals one-fifth of a gram
(0.200g)
Mixed cut
Cut that combines brilliant-cut and step-cut styles
Mohs scale
Ranking of the relative hardness of 10 minerals
Pavilion
Lower part of a faceted gem below the girdle
Point
One hundredth of a carat (0.01ct)
Scintillation
, The flashes of light and the contrasting dark areas you see when the diamond, the light,
or the observer moves
Simulant
A natural or manmade material that resembles a gem (also called imitation)
Single cut
A round stone with 17 or 18 facets
Stability
How well a diamond resists chemicals and temperature changes
Standard round brilliant
A round brilliant-cut stone with 57 or 58 facets. Often called a full cut
Step cut
A cutting style that features long narrow facets in rows parallel to the girdle on both the
crown and pavilion
Synthetic gem
A manmade gem with essentially the same chemical composition, crystal structure, and
properties as a natural gem
Thermal shock
Damages caused by sudden, extreme temperature changes
Toughness
How well a gemstone resists breaking and chipping
Value factors
Features used to judge the quality and value of all gemstones
Carbon
The mineral diamonds are primarily composed of
Crown, pavilion, and girdle
The three major parts of a diamond
A ton of rock
What a mine must process to recover a half carat of diamond
Brilliant cut
Cutting style with triangular or kite-shaped facets that radiate from the center toward the
girdle
Blemishes
Clarity characteristics confined to the surface of a polished diamond
Nearly colourless to a very light yellow, light brown, or light grey
Most diamonds used in jewellery
Diamond
Most durable gemstone. Also expensive due to rarity and how costly it is to mine
Baguette
A small, four-sided step cut that's rectangular, square, or tapered
Branded cut
Cutting style that's developed, named and promoted by a specific manufacturer
Brightness
The effect of all the diamond's internal and external reflections of white light
Clarity characteristics
The collective term for inclusions and blemishes
Apparent clarity
2018 (Answered) Complete Verified Solution.
Updated 2024.
Crown
Top part of the gem above the girdle
Culet
Small facet at the bottom of a finished gem
Durability
A gemstone's ability to withstand wear, heat, and chemicals
Facet
A flat, polished surface on a finished gem
Fancy cut
Any gemstone shape or cutting style other than a standard round brilliant
Fire
The flashes of colour you see in a polished diamond
Four Cs
Four value factors (clarity, colour, cut, and carat weight) that describe the quality of a
finished gem and also relates primarily to its value
Girdle
The narrow section of a finished gem that forms the boundary between the crown and
the pavilion and functions as the gem's setting edge
Hardness
How well a gemstone resists scratches and abrasion
Inclusion
Clarity characteristic totally enclosed in a polished gemstone or extending into it from
the surface
Karat
A unit for the fineness of gold, abbreviated "K" or "Kt"
Metric carat
The international unit of measure for gram weight. One carat equals one-fifth of a gram
(0.200g)
Mixed cut
Cut that combines brilliant-cut and step-cut styles
Mohs scale
Ranking of the relative hardness of 10 minerals
Pavilion
Lower part of a faceted gem below the girdle
Point
One hundredth of a carat (0.01ct)
Scintillation
, The flashes of light and the contrasting dark areas you see when the diamond, the light,
or the observer moves
Simulant
A natural or manmade material that resembles a gem (also called imitation)
Single cut
A round stone with 17 or 18 facets
Stability
How well a diamond resists chemicals and temperature changes
Standard round brilliant
A round brilliant-cut stone with 57 or 58 facets. Often called a full cut
Step cut
A cutting style that features long narrow facets in rows parallel to the girdle on both the
crown and pavilion
Synthetic gem
A manmade gem with essentially the same chemical composition, crystal structure, and
properties as a natural gem
Thermal shock
Damages caused by sudden, extreme temperature changes
Toughness
How well a gemstone resists breaking and chipping
Value factors
Features used to judge the quality and value of all gemstones
Carbon
The mineral diamonds are primarily composed of
Crown, pavilion, and girdle
The three major parts of a diamond
A ton of rock
What a mine must process to recover a half carat of diamond
Brilliant cut
Cutting style with triangular or kite-shaped facets that radiate from the center toward the
girdle
Blemishes
Clarity characteristics confined to the surface of a polished diamond
Nearly colourless to a very light yellow, light brown, or light grey
Most diamonds used in jewellery
Diamond
Most durable gemstone. Also expensive due to rarity and how costly it is to mine
Baguette
A small, four-sided step cut that's rectangular, square, or tapered
Branded cut
Cutting style that's developed, named and promoted by a specific manufacturer
Brightness
The effect of all the diamond's internal and external reflections of white light
Clarity characteristics
The collective term for inclusions and blemishes
Apparent clarity
