Polished Diamond Quality Improvement Evaluation Through Deep Boiling Training

Objectives:
• Understand the fundamentals of diamond quality assessment (4Cs).
• Explain the purpose and principles of deep boiling in diamond processing.
• Identify safety protocols and equipment for deep boiling.
• Recognize the role of deep boiling in improving diamond clarity.

Topics:
• Overview of diamond grading: carat, cut, colour, clarity
• Introduction to deep boiling: history and industry relevance
• Safety procedures: PPE, chemical handling, ventilation
• Equipment setup: boiling vessels, temperature control, filtration systems
• Pre-boiling inspection: identifying diamonds suitable for boiling
• Basic chemistry of boiling solutions (acids, alkalis)
• Documentation and record-keeping requirements
• Unit standard outcomes and assessment criteria

Objectives:
• Classify different types of inclusions and blemishes in polished diamonds.
• Relate inclusion types to boiling effectiveness.
• Use magnification tools to examine diamond features.
• Assess diamond clarity grades before and after boiling.

Topics:
• Inclusion types: crystals, feathers, clouds, needles, pinpoints
• Blemish types: scratches, nicks, abrasions, burn marks
• Using loupes and microscopes for inspection
• Clarity grading scale (FL to I3) and inclusion visibility
• Mapping inclusions prior to treatment
• Predicting boiling outcomes based on inclusion nature
• Practical exercise: examining sample diamonds
• Recording observations in standard forms

Objectives:
• Describe chemical reactions involved in deep boiling.
• Prepare boiling solutions with correct concentrations.
• Handle chemicals safely according to SDS guidelines.
• Adjust solution pH and temperature for optimal results.

Topics:
• Chemistry of acid boiling (sulphuric, nitric, hydrochloric)
• Alkaline boiling methods and applications
• Solution concentration calculations and measurement
• pH testing and adjustment techniques
• Temperature control: effects on reaction rates
• Neutralization and waste disposal procedures
• Safety data sheets (SDS): interpretation and compliance
• Practical: mixing and testing a boiling solution

Objectives:
• Set up and calibrate boiling equipment.
• Monitor and adjust time, temperature, and solution composition.
• Identify signs of over-boiling or under-boiling.
• Maintain process logs accurately.

Topics:
• Boiling cycles: duration and temperature profiles
• Effect of agitation on inclusion removal
• Monitoring solution concentration during boiling
• Troubleshooting common issues: solution degradation, uneven heating
• Process control documentation and logs
• Practical: running a controlled boiling batch
• Post-boiling cooling and rinsing procedures
• Quality checks at intermediate stages

Objectives:
• Clean diamonds after boiling using appropriate methods.
• Inspect diamonds for residual inclusions and surface damage.
• Differentiate between removed inclusions and new damage.
• Record post-treatment clarity grades.

Topics:
• Cleaning methods: ultrasonic, steam, chemical rinses
• Drying techniques to prevent residue
• Detailed inspection under magnification
• Comparison with pre-boiling records
• Identifying and documenting improvements
• Detecting adverse effects: etching, colour change, fractures
• Practical: cleaning and inspecting a batch
• Updating diamond quality records

Objectives:
• Apply specialized boiling methods for different inclusion types.
• Adjust parameters for deep-seated inclusions.
• Use sequential boiling processes for complex cases.
• Evaluate effectiveness of advanced techniques.

Topics:
• Boiling for crystal inclusions: temperature and time variations
• Feather inclusion treatment: risk of fracture propagation
• Multiple cycle boiling: when and how
• Additives to enhance inclusion removal
• Case studies: challenging inclusion scenarios
• Practical: treating diamonds with specific inclusion types
• Comparative analysis of results
• Decision-making for repeat boiling

Objectives:
• Implement quality control checks throughout the boiling process.
• Use statistical process control (SPC) tools.
• Identify non-conforming outcomes and root causes.
• Apply corrective actions to maintain quality standards.

Topics:
• QC checkpoints: pre-boil, during boil, post-boil
• Sampling plans and frequency
• SPC charts: tracking clarity improvement rates
• Root cause analysis for poor outcomes
• Corrective actions: re-boiling, solution adjustment
• Documentation of non-conformances
• Practical: conducting a QC audit on a batch
• Continuous improvement principles

Objectives:
• Grade clarity of boiled diamonds using standard scales.
• Assess colour changes induced by boiling.
• Understand how boiling affects fluorescence.
• Document final quality grades accurately.

Topics:
• Clarity grading after treatment: rules and exceptions
• Colour grading: detecting shifts in hue and saturation
• Fluorescence evaluation: changes due to boiling
• Combining clarity and colour grades for overall quality
• Certification requirements and reporting
• Practical: grading a set of boiled diamonds
• Inter-laboratory consistency
• Ethical considerations: disclosure of treatment

Objectives:
• Perform routine maintenance on boiling equipment.
• Troubleshoot common equipment failures.
• Replace worn components safely.
• Calibrate temperature and pressure sensors.

Topics:
• Daily maintenance checklist: cleaning, inspection
• Identifying wear: heating elements, seals, valves
• Troubleshooting temperature fluctuations
• Pressure system checks and leak detection
• Sensor calibration procedures
• Spare parts inventory management
• Practical: performing maintenance tasks
• Safety lockout/tagout procedures

Objectives:
• Comply with OHS Act requirements for chemical handling.
• Implement spill response and waste management plans.
• Use personal protective equipment correctly.
• Conduct risk assessments for boiling operations.

Topics:
• OHS Act and Regulations: duties of employers and employees
• Chemical storage and labelling (SANS 10228)
• Spill containment and cleanup procedures
• Waste disposal: acid neutralization, recycling
• Emergency response: first aid, fire, chemical exposure
• Risk assessment methodology
• Practical: conducting a risk assessment
• Environmental impact mitigation

Objectives:
• Plan and execute a complete deep boiling batch from start to finish.
• Apply all learned skills in a simulated production environment.
• Manage time and resources efficiently.
• Produce a batch of polished diamonds with improved quality.

Topics:
• Batch planning: selection of diamonds, solution preparation
• Execution: loading, boiling, cooling, cleaning
• Real-time monitoring and adjustments
• Team coordination and communication
• Documentation throughout the process
• Final inspection and grading
• Practical: full batch processing exercise
• Debrief and performance review

Objectives:
• Demonstrate competence in all unit standard outcomes.
• Complete practical and theoretical assessments.
• Review key concepts and address gaps.
• Prepare for certification and workplace application.

Topics:
• Summative practical assessment: boiling and grading
• Written knowledge test
• Portfolio of evidence compilation
• Review of learning outcomes
• Feedback and improvement areas
• Industry best practices and trends
• Certification process overview
• Course evaluation and closing