Large Diamond Gemstone Design And Marking For Parting Training

Objectives:
• Understand the scope and importance of large diamond gemstone design and parting in the industry
• Identify key terminology and concepts related to diamond design and parting
• Recognize the role of SAQA unit standard 110221 in professional practice
• Outline the course structure and assessment requirements

Topics:
• Overview of the diamond value chain: from rough to polished
• Definition of large diamonds (typically >1 carat) and their significance
• Introduction to gemstone design principles: symmetry, proportion, and optical performance
• Explanation of parting: the process of splitting rough diamonds along cleavage planes
• Safety and ethical considerations in diamond handling
• Overview of tools and equipment used in design and parting

Objectives:
• Describe the crystal structure of diamond and its implications for design and parting
• Identify cleavage planes and their orientation in rough diamonds
• Explain how optical properties (refractive index, dispersion) affect design decisions
• Relate diamond hardness and anisotropy to cutting and parting techniques

Topics:
• Diamond crystal system: cubic, octahedral, dodecahedral forms
• Cleavage planes: {111} and their role in parting
• Optical properties: brilliance, fire, and scintillation
• Hardness variations and grain direction
• Inclusions and their impact on design and parting
• Practical exercise: Identifying crystal forms using models

Objectives:
• Evaluate rough diamonds for quality, size, and shape
• Apply planning techniques to maximize yield and value
• Use inclusion mapping to inform design and parting decisions
• Understand the economic factors influencing design choices

Topics:
• Rough diamond grading: carat weight, color, clarity, and shape
• Inclusion mapping: types, positions, and impact on value
• Yield optimization: balancing weight retention against cut quality
• Planning for polished shapes: round brilliant, princess, emerald, etc.
• Cost-benefit analysis of different design options
• Practical exercise: Evaluating rough diamonds and creating a preliminary plan

Objectives:
• Apply fundamental design principles to large diamond gemstones
• Calculate critical angles for optimal light performance
• Design crown and pavilion angles for maximum brilliance
• Adjust designs to accommodate inclusions and crystal irregularities

Topics:
• Proportions and angles: crown angle, pavilion angle, table size, girdle thickness
• Light behavior: total internal reflection, leakage, and extinction
• Design rules for large diamonds: modified brilliant cuts, step cuts, mixed cuts
• Computer-aided design (CAD) software introduction
• Design modifications for included or irregular rough
• Practical exercise: Designing a round brilliant for a large rough

Objectives:
• Design fancy-shaped large diamonds (e.g., pear, oval, marquise, heart)
• Understand the unique optical and structural challenges of fancy shapes
• Apply design adjustments to enhance beauty and hide inclusions
• Evaluate the market demand for various fancy shapes

Topics:
• Fancy shape categories: modified brilliants, step cuts, and mixed cuts
• Design parameters for pear, oval, marquise, heart, and cushion shapes
• Optical performance in fancy shapes: bow-tie effect and mitigation
• Inclusion placement strategies for fancy shapes
• Market trends and value factors for fancy shapes
• Practical exercise: Designing a fancy shape for a given rough

Objectives:
• Explain the theory behind diamond parting along cleavage planes
• Identify the factors that influence successful parting
• Describe the tools and techniques used for parting
• Assess the risks and benefits of parting versus sawing

Topics:
• Cleavage mechanics: stress concentration, crystal orientation
• Factors affecting parting: inclusion presence, crystal perfection, internal stresses
• Parting tools: blades, hammers, and specialized jigs
• Parting technique: notching, striking, and controlling propagation
• Comparison with sawing: laser, diamond saw, and wire saw
• Safety protocols for parting operations

Objectives:
• Prepare rough diamonds for parting by notching and orientation
• Set up the parting workstation safely and efficiently
• Practice notching techniques on synthetic or low-value diamonds
• Understand the importance of precision in notch placement

Topics:
• Notching: location, depth, and angle relative to cleavage plane
• Orientation verification using crystal form and optical methods
• Workstation setup: lighting, magnification, and tool arrangement
• Practice notching on synthetic diamonds
• Troubleshooting common notching errors
• Practical exercise: Notching a synthetic diamond for parting

Objectives:
• Execute the parting process on practice diamonds
• Control the cleavage propagation to achieve desired split
• Evaluate the quality of parted surfaces and adjust technique
• Apply corrective measures if parting deviates

Topics:
• Striking technique: force, angle, and follow-through
• Monitoring cleavage propagation: visual and auditory cues
• Dealing with deviations: stopping and redirecting the split
• Post-parting inspection: surface quality, step formation, and yield
• Documentation and recording of parting outcomes
• Practical exercise: Parting practice diamonds under supervision

Objectives:
• Adapt parting techniques for large diamonds (>5 carats)
• Manage increased risk and value in large stone parting
• Use advanced tools and methods for large diamond parting
• Apply stress analysis to predict parting behavior

Topics:
• Challenges of large diamond parting: weight, internal stresses, inclusion complexity
• Advanced notching: multiple notches, controlled stress direction
• Use of laser-assisted parting for precision
• Stress modeling and simulation software
• Case studies of large diamond parting successes and failures
• Practical exercise: Planning a parting strategy for a large rough

Objectives:
• Assess parted rough for optimal design modifications
• Adjust original design plans based on parted surfaces and new inclusions
• Recalculate proportions and angles for the new pieces
• Understand the value implications of parting decisions

Topics:
• Inspection of parted surfaces: flatness, step height, and inclusion exposure
• Design modification strategies: reorienting, resizing, or changing shape
• Yield analysis: comparing pre- and post-parting carat weight
• Cost-benefit analysis of parting vs. alternative approaches
• Practical exercise: Modifying a design after parting

Objectives:
• Understand the purpose and methods of marking diamonds for parting
• Apply marking techniques to indicate cleavage planes and cut lines
• Use marking to communicate design intent to cutters
• Evaluate the accuracy and permanence of different marking materials

Topics:
• Marking materials: ink, scribe, laser etching, and adhesive markers
• Marking techniques: dotting, line drawing, and color coding
• Relationship between marking and parting outcome
• Marking for multiple pieces from a single rough
• Practical considerations: visibility, removal, and durability
• Practical exercise: Marking a rough diamond for planned parting

Objectives:
• Combine design principles with parting planning for optimal results
• Create a comprehensive plan from rough evaluation to final design
• Use software tools to simulate design and parting scenarios
• Present and justify design/parting plans to peers

Topics:
• Step-by-step workflow: rough evaluation → design → parting plan → marking
• Software integration: CAD for design, simulation for parting
• Decision trees for complex rough diamonds
• Peer review and feedback on plans
• Documentation and presentation skills
• Practical exercise: Creating a complete plan for a given rough

Objectives:
• Inspect and grade parted diamonds for cut quality and clarity
• Identify defects introduced during parting (e.g., chips, steps)
• Apply grading standards (GIA, AGS) to parted diamonds
• Understand the impact of parting on diamond value

Topics:
• Cut quality parameters: proportions, symmetry, polish
• Clarity grading of parted surfaces: new inclusions, fractures
• Common parting defects: step marks, rough surfaces, misorientation
• Grading tools: loupe, microscope, proportion scope
• Value assessment: comparing parted vs. non-parted diamonds
• Practical exercise: Grading a set of parted diamonds

Objectives:
• Describe laser parting technology and its advantages over mechanical methods
• Evaluate new technologies in diamond design and parting
• Understand the future trends in large diamond processing
• Compare traditional vs. modern techniques in terms of precision and yield

Topics:
• Laser parting: principles, equipment, and safety
• Advantages: precision, minimal material loss, complex cuts
• Limitations: cost, heat effects, and diamond type suitability
• Emerging technologies: waterjet cutting, ultrasonic parting
• Industry trends: automation, AI in design, and sustainability
• Practical exercise: Observing a laser parting demonstration (if available)

Objectives:
• Analyze real-world case studies of large diamond design and parting
• Identify key decisions and their outcomes
• Apply lessons learned to future projects
• Discuss ethical and market implications

Topics:
• Famous large diamonds: Cullinan, Koh-i-Noor, Hope, etc.
• Case study 1: Successful parting of a large rough
• Case study 2: Design innovation for maximum brilliance
• Case study 3: Parting failure and lessons learned
• Ethical considerations: conflict diamonds, provenance
• Group discussion and analysis

Objectives:
• Apply design and marking skills on practice diamonds
• Execute a complete design and marking plan from start to finish
• Demonstrate proficiency in using design and marking tools
• Work under time constraints to simulate real-world pressure

Topics:
• Workshop setup: individual workstations with tools and materials
• Task: Design and mark a large rough diamond (synthetic) for parting
• Steps: rough evaluation → design → marking → documentation
• Instructor guidance and troubleshooting
• Peer collaboration and feedback
• Practical exercise: Complete design and marking on provided rough

Objectives:
• Execute parting on practice diamonds according to design and marking
• Demonstrate safe and controlled parting technique
• Evaluate the quality of the parted pieces
• Adjust technique based on outcomes

Topics:
• Workshop setup: parting stations with safety equipment
• Task: Part a previously designed and marked synthetic diamond
• Steps: preparation → notching → striking → inspection
• Instructor supervision and corrective feedback
• Documentation of results
• Practical exercise: Parting a synthetic diamond

Objectives:
• Assess parted rough and adjust design accordingly
• Grade the parted pieces for cut quality and clarity
• Provide a final report on the process and outcomes
• Reflect on learning and identify areas for improvement

Topics:
• Workshop: Inspect parted pieces and modify original design
• Grading: use tools to assess cut, clarity, and symmetry
• Report writing: documenting decisions, results, and lessons
• Peer review of reports
• Individual feedback from instructors
• Practical exercise: Finalize design and grade parted diamonds

Objectives:
• Understand the business context of large diamond design and parting
• Apply ethical practices in diamond sourcing and processing
• Calculate costs and pricing for design and parting services
• Develop a professional portfolio and marketing strategy

Topics:
• Business models: independent contractor, employee, entrepreneur
• Costing: materials, labor, equipment, overhead
• Pricing strategies: value-based, market-based
• Ethical sourcing: Kimberley Process, conflict-free certification
• Building a professional portfolio: documenting work
• Marketing services to clients and employers

Objectives:
• Demonstrate comprehensive knowledge and skills through a final assessment
• Complete a practical exam on design, marking, and parting
• Review key concepts and address any remaining questions
• Receive feedback and certification guidance

Topics:
• Written exam: theory covering all course topics
• Practical exam: design, mark, and part a synthetic diamond
• Oral presentation: explain decisions and outcomes
• Course review: Q&A session
• Feedback on performance and areas for improvement
• Certification process and next steps