35 Questions
What is the term for the light that returns to the eye after entering a gem through the crown?
Brilliance
Which cutting style combines brilliant-cut and step-cut facets?
Mixed cut
What is the term for the process of removing heavily included sections from gemstone rough?
Cobbing
What is the lower part of a faceted gem below the girdle?
Pavilion
What is the term for the relationship between the height of a gem's crown and the depth of its pavilion?
Crown-height to pavilion-depth ratio
What is the term for a design engraved into the surface of a gemstone?
Intaglio
What is the term for a smoothly rounded polished gem with a domed top and a flat or curved base?
Cabochon
What is the term for the horizontal spinning metal disk used to grind or polish a gem's facets?
Lap
What is the term for the process of producing the approximate shape of the finished gemstone?
Preform
What is the term for a wooden or metal stick that holds the preform during faceting?
Dopstick
What is the primary purpose of grinding in gemstone cutting?
To create approximate shape and produce flat planes for polishing
What type of gemstone cut is characterized by triangular or kite-shaped facets?
Brilliant cut
What is the term for the stage in gem cutting that produces the smoothest possible surface?
Polishing
What is the term for the relationships between the angles and measurements of a polished gem?
Proportions
What is the term for a gem carving style in which the design projects slightly from a flat or curved surface?
Cameo
What is the term for the upper part of a faceted gem above the girdle?
Crown
What is the purpose of a dopstick in gem cutting?
To hold the preform during faceting
What is the term for dividing gem rough into easily handled pieces and removing waste areas?
Sawing
What is the term for the light that returns to the eye after entering a gem through the crown?
Brilliance
What is the term for giving a gemstone an approximate shape before polishing?
Grinding
What is the primary purpose of the lap in gemstone cutting?
To grind or polish a gem's facets
What is the purpose of cobbing in gemstone cutting?
To remove heavily included sections from gemstone rough
What type of gemstone cut has triangular or kite-shaped facets?
Brilliant cut
What is the term for the angles and measurements of a polished gem?
Proportions
What is the term for the process of dividing gem rough into easily handled pieces?
Sawing
What is the term for the upper part of a faceted gem above the girdle?
Crown
What is the term for a gem carving style in which the design projects slightly from a flat or curved surface?
Cameo
What is the term for the final stage in gem cutting that produces the smoothest possible surface?
Polishing
What is the term for the narrow section on a gem that functions as the gems setting edge?
Girdle
What is the largest facet on a stone?
Table
What is the term for the arrangement of a stones facets?
Style
What term used to describe the precision and balance between facets?
Symmetry
What cut is NOT limited to specific proportions and measurements?
Designer Cut
What device holds the dopstick during the cutting and polishing processes?
Faceting head
What form of cutting allows you to produce free form curves and flat surfaces?
Fantasy Cut
Study Notes
Gemstone Cutting and Polishing
- Brilliance refers to the light that enters a gem through the crown, reflects off its pavilion facets, and exits back through the crown.
- Grinding gives a gemstone its approximate shape or produces flat planes for polishing facets.
- Intaglio is a design engraved into the surface of a gemstone.
Cutting Styles
- Brilliant cut is a cutting style with triangular or kite-shaped facets that radiate from the center toward the girdle.
- Cabochon is a smoothly rounded polished gem with a domed top and a flat or curved base.
- Cameo is a gem carving style where the design projects slightly from a flat or curved surface.
- Mixed cut combines brilliant-cut and step-cut facets.
Gemstone Anatomy
- Pavilion is the lower part of a faceted gem below the girdle.
- Crown is the top part of the gem above the girdle.
- Girdle is the area where the crown and pavilion meet.
- Crown-height to pavilion-depth ratio is the relationship between the height of a gem's crown and the depth of its pavilion.
Gemstone Preparation
- Cobbing is the process of removing heavily included sections from gemstone rough by carefully tapping it with a small hammer.
- Preform is the rough ground to the approximate shape of the finished stone.
- Sawing is the process of dividing gem rough into easily handled pieces and removing waste areas.
- Dopstick is a wooden or metal stick that holds the preform during faceting.
Polishing and Finishing
- Polishing is the final stage in gem cutting that produces the smoothest possible surface.
- Lap is a horizontal spinning metal disk used to grind or polish a gem's facets.
- Proportions refer to the angles and relative measurements of a polished gem, and the relationships between them.
- Designer cuts are artistic gem cuts that aren't limited to specific proportions or shapes.
Gemstone Cutting and Polishing
- Brilliance refers to the light that enters a gem through the crown, reflects off its pavilion facets, and exits back through the crown.
- Grinding gives a gemstone its approximate shape or produces flat planes for polishing facets.
- Intaglio is a design engraved into the surface of a gemstone.
Cutting Styles
- Brilliant cut is a cutting style with triangular or kite-shaped facets that radiate from the center toward the girdle.
- Cabochon is a smoothly rounded polished gem with a domed top and a flat or curved base.
- Cameo is a gem carving style where the design projects slightly from a flat or curved surface.
- Mixed cut combines brilliant-cut and step-cut facets.
Gemstone Anatomy
- Pavilion is the lower part of a faceted gem below the girdle.
- Crown is the top part of the gem above the girdle.
- Girdle is the area where the crown and pavilion meet.
- Crown-height to pavilion-depth ratio is the relationship between the height of a gem's crown and the depth of its pavilion.
Gemstone Preparation
- Cobbing is the process of removing heavily included sections from gemstone rough by carefully tapping it with a small hammer.
- Preform is the rough ground to the approximate shape of the finished stone.
- Sawing is the process of dividing gem rough into easily handled pieces and removing waste areas.
- Dopstick is a wooden or metal stick that holds the preform during faceting.
Polishing and Finishing
- Polishing is the final stage in gem cutting that produces the smoothest possible surface.
- Lap is a horizontal spinning metal disk used to grind or polish a gem's facets.
- Proportions refer to the angles and relative measurements of a polished gem, and the relationships between them.
- Designer cuts are artistic gem cuts that aren't limited to specific proportions or shapes.
Gemstone Cutting and Polishing
- Brilliance refers to the light that enters a gem through the crown, reflects off its pavilion facets, and exits back through the crown.
- Grinding gives a gemstone its approximate shape or produces flat planes for polishing facets.
- Intaglio is a design engraved into the surface of a gemstone.
Cutting Styles
- Brilliant cut is a cutting style with triangular or kite-shaped facets that radiate from the center toward the girdle.
- Cabochon is a smoothly rounded polished gem with a domed top and a flat or curved base.
- Cameo is a gem carving style where the design projects slightly from a flat or curved surface.
- Mixed cut combines brilliant-cut and step-cut facets.
Gemstone Anatomy
- Pavilion is the lower part of a faceted gem below the girdle.
- Crown is the top part of the gem above the girdle.
- Girdle is the area where the crown and pavilion meet.
- Crown-height to pavilion-depth ratio is the relationship between the height of a gem's crown and the depth of its pavilion.
Gemstone Preparation
- Cobbing is the process of removing heavily included sections from gemstone rough by carefully tapping it with a small hammer.
- Preform is the rough ground to the approximate shape of the finished stone.
- Sawing is the process of dividing gem rough into easily handled pieces and removing waste areas.
- Dopstick is a wooden or metal stick that holds the preform during faceting.
Polishing and Finishing
- Polishing is the final stage in gem cutting that produces the smoothest possible surface.
- Lap is a horizontal spinning metal disk used to grind or polish a gem's facets.
- Proportions refer to the angles and relative measurements of a polished gem, and the relationships between them.
- Designer cuts are artistic gem cuts that aren't limited to specific proportions or shapes.
Learn about the key terms related to gemstone cuts, including brilliance, grinding, intaglio, and lap. Understand the characteristics of gemstones and how they are cut and polished.
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