Introduction
Value distribution through the diamond pipe. The course content and how to use given skills to achieve added value. Two general methods for rough diamond evaluation.
Properties of rough diamonds
- Mineralogical, physical and trade diamond classifications.
- Physical and optical diamond properties.
- Consuming properties of rough diamonds.
- Shapes of diamond rough. Various distortions of diamond shape. Crystallographic directions in diamond.
- Color in diamonds. Origin of diamond color. Color in rough and polished diamonds.
- Rough diamond sorting and evaluation as it used by leading diamond mining companies.
- How rough diamond shape, color and clarity correspond with polished diamond’s shape, color and clarity.
- Morphological approach for sorting and technological approach for cutting a diamond.
- Current classification used for rough sorting.
- Structure and main positions of the current classification.
- Grading rough diamonds by size and weight.
- Grading rough diamonds by shape and shape distortions.
- Grading rough diamonds by color and clarity.
- Basic principles of evaluation big (10 ct and up) diamonds through polished diamonds value.
- How to work with current price-lists.
- How to determine a rough parcel value.
- Principles of combination various positions for the parcel preparation.
- Advantages and drawbacks of the modern trade classification.
- The main differences between evaluation through sorting/pricelist and through polished diamonds.
Rough evaluation through polished diamonds
- Training opportunities of PACOR software.
- Parametrical and scanned three-dimensional models of rough diamond.
- Prognosis by yield and by efficiency.
- Skills of a diamond marker.
- Practical workshop with rough diamonds and their three-dimensional models.
- How to work with perfect octahedrons.
- How to determine weight of the future diamond: formula, tables, PACOR and DiamCalc software.
- Basic marking options. Symmetrical and nonsymmetrical marking.
- How to find the main crossection.
- Typical shape distortions.
- How to determine the sawing plane position.
- Polished diamonds: modern grading systems and price-lists.
- How polished diamond weight corresponds with its value. Jumps of polished price with weight.
- Diamonds cut for weight. Spread in diamonds.
- “Ideal” diamond cut. Highest grades in different grading systems.
- How to work with cut proportions.
- Inclination of the sawing plane. Adding value by inclination.
- One diamond or two diamonds? More than two diamonds.
- Inclusions in diamond:
- How to find an inclusion
- How to find the real position of an inclusion.
- How to saw through an inclusion.
- Opening a stone.
- How to predict the polished diamond clarity.
- Challenge: leave or cut – off an inclusion.
- Work with rounded stones.
- Polished diamond fancy shapes. How to choose the best shape. Cut grading for fancy shapes.
- Adding value by cutting a fancy shape instead of round cut.
- Typical mistakes of diamond markers.
- How to use information about color grade.
- Diamond cutting and polishing.
- Main technological operations.
- Different technologies for various diamonds.
- How to use knowledge about cutting during rough diamond sorting and evaluation.
- New technologies for diamond cutting and polishing.
- World diamond market.
Final testing: test of theory and evaluation of 5 rough diamonds.
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