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Article: Diamond cutting

Diamond cutting

Diamond Cutting Process

  • Planning
  • Diamond manufacturers analyze diamond rough from an economic perspective
  • Objectives: maximum return on investment and quick sale
  • Scanning devices used to create a 3D model of the rough stone
  • Inclusions photographed and placed on the model for optimal cutting
  • Factors influencing cut choice: market trends, original shape of the rough stone, location of inclusions
  • Cleaving or Sawing
  • Cleaving separates diamond rough into separate pieces
  • Groove made with laser or saw, then split with a steel blade
  • Cleavage can occur along any of the four planes parallel to the faces of an octahedral diamond
  • Sawing uses a diamond saw or laser to cut rough into separate pieces
  • Sawing gives diamonds their initial shape
  • Bruting
  • Polishing

Maximizing Value

  • Cut choice influenced by weight retention and popularity of certain shapes
  • Weight retention analysis to find optimal combination of finished stones
  • Different cuts preferred for different crystal shapes
  • Cutting and polishing results in a significant loss of weight (about 50%)
  • Compromises may be made to preserve weight or avoid inclusions

Color Retention

  • Cutting can influence the color grade of colored diamonds
  • Certain cuts intensify the color of the diamond
  • Green diamonds often have surface coloration, cut to preserve the color
  • Naturals left on the finished gem provide the color to the diamond
  • Color enhancement can increase the value of the diamond

Diamond Polishing

  • Diamond polishing is the final stage in diamond manufacturing.
  • The process involves a diamond crossworker placing the main facets on the diamond to maximize weight, clarity, and angles.
  • After the initial crossworking, the diamond is polished by smoothing the main facets.
  • The final facets, including the stars and upper and lower girdle facets, are polished by a brillianteer.
  • Polishing is done by forcing the diamond against a spinning disk with abrasive.

Final Inspection and Recutting

  • Final Inspection
  • The final stage of diamond cutting involves thoroughly cleaning the diamond in acids.
  • The diamond is then examined to ensure it meets the quality standards of the manufacturer.
  • This inspection is crucial to determine the diamond's market value.
  • Quality standards include factors such as clarity, color, and cut.
  • The inspection ensures that only diamonds meeting these standards are released to the market.
  • Recutting
  • Diamonds can be recut into new shapes to increase their value and desirability.
  • Changes in market preferences and trends often drive the need for recutting.
  • For example, the marquise cut diamond lost popularity in later decades and could be recut into an oval or pear shape.
  • Recutting can result in a loss of total weight, typically around 5 to 10%.
  • Clarity can also be improved through recutting by removing inclusions.

Diamond cutting Data Sources

Reference URL
Knowledge Graph

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