SAQA All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Polish bottom halves on diamond gemstones 
SAQA US ID UNIT STANDARD TITLE
253800  Polish bottom halves on diamond gemstones 
ORIGINATOR
SGB Mining and Minerals 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Fabrication and Extraction 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03  20 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
This unit standard is useful for people who intend following a career in the diamond processing sector and who are required to polish bottom halves on diamond gemstones. It is for persons required to polish the final sixteen facets to bottom lapped diamond gemstones by the partial splitting of the eight main bottom facets. This process is known as bottom half making.

Learners credited with this unit standard are able to:
  • Identify the equipment and tools used to polish the bottom halves on diamond gemstones and describe their application.
  • Demonstrate knowledge of the structure of diamond gemstones and the implications for polishing sawn stones.
  • Demonstrate knowledge of the structure of diamond gemstones and the implications for polishing makeable stones.
  • Set and clamp diamond gemstones for bottom halves.
  • Finish the sixteen bottom halves on diamond gemstones.
  • Conduct post-bottom-half cleaning, checking and security activities.

    The skills, knowledge and understanding demonstrated within this unit standard are essential for social and economic transformation and contribute to the upliftment and economic growth of the mining and minerals sector, particularly in the aspect of beneficiation.

    This unit standard is intended to promote general skills, knowledge and understanding of the diamond processing industry in the mining and minerals sector in order to ensure knowledgeable and informed workers. 

  • LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    It is assumed that learners are already competent in:
  • Communication and Mathematical Literacy at NQF Level 2. 

  • UNIT STANDARD RANGE 
    The scope and context applies to the conversion of rough diamond gemstones into cut and polished diamond gemstones for sale into local and international markets.

    This unit standard applies to persons polishing uncomplicated sawn and makeable diamond gemstones under general supervision, or where the person performing the activity deals with complicated sawn or makeable diamond gemstones only under close direction of a supervisor. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Identify the equipment and tools used to add bottom halves on diamond gemstones and describe their application. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The tools and their components used are identified and their use in different applications is explained in terms of key features, applications and methods for use. 

    ASSESSMENT CRITERION 2 
    Practices are explained to maintain good housekeeping, safety in the workplace and care of equipment in line with workplace specific requirements. 

    ASSESSMENT CRITERION 3 
    The consequences of deviating from workplace specific practices are described in terms of potential impact on health, safety, equipment, products and productivity. 

    SPECIFIC OUTCOME 2 
    Demonstrate knowledge of the structure of diamond gemstones and the implications for polishing sawn stones. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Four points in sawn stones are identified in different diamond types from drawings. 

    ASSESSMENT CRITERION 2 
    The polishing grains in four point sawn stones are identified in terms of the crystallography of diamonds. 

    ASSESSMENT CRITERION 3 
    Problems that can be encountered when polishing four point sawn stones are described in terms of types of problems, key features, implications for polishing and methods to overcome such problems. 
    ASSESSMENT CRITERION RANGE 
    The types of problems that can be encountered must include:
  • Gletzes.
  • Naat.
  • Cross-grain.
  • Holes.
  • Flaws.
  • Impurities.
  • Naturals.
     

  • ASSESSMENT CRITERION 4 
    Faceting hints and techniques for polishing bottom halves on four point sawn stones are explained in terms of different applications and the consequences of using inappropriate polishing techniques. 

    SPECIFIC OUTCOME 3 
    Demonstrate knowledge of the structure of diamond gemstones and the implications for polishing makeable stones. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Two points, three points and four points are identified from drawings. 

    ASSESSMENT CRITERION 2 
    The polishing grains in two, three and four point makeable stones are identified in terms of the crystallography of diamonds. 

    ASSESSMENT CRITERION 3 
    Problems that can be encountered when polishing two, three and four point makeable stones are described in terms of types of problems, key features, implications for polishing and methods to overcome such problems. 
    ASSESSMENT CRITERION RANGE 
    The types of problems that can be encountered must include:
  • Gletzes.
  • Naat.
  • Cross-grain.
  • Holes.
  • Flaws.
  • Impurities.
  • Naturals.
     

  • ASSESSMENT CRITERION 4 
    Faceting hints and techniques for polishing bottom halves on two, three and four point makeable stones are explained in terms of different applications and the consequences of using inappropriate polishing techniques. 

    SPECIFIC OUTCOME 4 
    Set and clamp diamond gemstones for polishing bottom halves. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Appropriate personal protective clothing and equipment is selected and applied according to required standards of occupational health and safety. 

    ASSESSMENT CRITERION 2 
    Stones received in pots are checked to ensure the appropriate pot has been selected. Inappropriate selection is dealt with in terms of workplace specific procedures. Appropriate selections are set in polishing tangs for
    polishing bottom halves according to workplace specific operating procedures. 

    ASSESSMENT CRITERION 3 
    A scaiffe is ensured to have been correctly prepared for polishing bottom halves, before putting the stone on the scaiffe. 

    ASSESSMENT CRITERION 4 
    The polishing tang is set on the appropriate grain settings for polishing bottom halves on sawn stones. 

    SPECIFIC OUTCOME 5 
    Finish the sixteen bottom halves on diamond gemstones. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Stones have bottom halves polished within defined quality and output standards. 
    ASSESSMENT CRITERION RANGE 
    Defined quality and output standards will be found in the employer's:
  • Work specifications.
  • Tariff agreements.
  • Parcel instructions.
  • Policies and Procedures.
     

  • ASSESSMENT CRITERION 2 
    The girdle is evened out when splitting the eight main bottom facets. 

    ASSESSMENT CRITERION 3 
    The scaiffe is frequently checked for any defects during the process of polishing bottom halves. Remedial action is taken in line with workplace specific procedures. 

    ASSESSMENT CRITERION 4 
    Weights of diamond gemstones are within the laid down tolerance levels after polishing bottom halves. 
    ASSESSMENT CRITERION RANGE 
    Laid down tolerance levels will be found in the employer's:
  • Work specifications.
  • Tariff agreements.
  • Policies and Procedures.
     

  • SPECIFIC OUTCOME 6 
    Conduct post-bottom-half cleaning, checking and security activities. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Diamond gemstones are removed from pots after polishing bottom halves, cleaned and inspected for quality of finish in relation to workplace specifications. Remedial action, where necessary, is taken in line with workplace specific procedures. 

    ASSESSMENT CRITERION 2 
    Good housekeeping is exercised after polishing bottom halves on diamond gemstones. 
    ASSESSMENT CRITERION RANGE 
    Good housekeeping must include:
  • Clean pots, tangs and claws.
  • Replace pots, claws and tangs into correct storage facilities.
  • Maintenance of personal protective clothing and equipment.
     

  • ASSESSMENT CRITERION 3 
    Diamond gemstones are accounted for after polishing bottom halves in accordance with the workplace security system. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this unit standard must be registered as an assessor with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Any institution offering learning that will enable the achievement of this unit standard must be accredited as a provider with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Assessment and moderation of assessment will be overseen by the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA, according to the ETQA's policies and guidelines for assessment and moderation.
  • Moderation must include both internal and external moderation of assessments, unless ETQA policies specify otherwise.
  • Anyone wishing to be assessed against this unit standard may apply to be assessed by any assessment agency, assessor or provider institution that is accredited by the relevant ETQA. 

  • UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    The following embedded knowledge is addressed in an integrated way in the unit standard.

    Knowledge relating to the properties of a diamond gemstone:
  • Understanding the various properties of the diamond and the effect that polishing may have.
  • The action that the different components of the polishing equipment may have on the diamond.
  • Importance of equipment being level for polishing.
  • Awareness of the damage to a diamond that can be caused by equipment that is not level, or where the diamond is not properly applied to the scaiffe.

    Occupational Health, Safety and Environmental issues:
  • Significant hazards and risks related to gemstone processing, their consequences and mitigating actions.
  • Safety measures related to diamond processing.
  • PPE requirements and the reason for each.
  • Impact on the environment and mitigating actions.
  • Emergency procedures.

    Legislative and structural environment:
  • Importance of adherence to health and safety requirements during processing.
  • Importance of care and maintenance of tools and equipment.
  • Codes of practice.

    Communication:
  • Reporting requirements and ability.
  • Communicating with relevant personnel.
  • Liaison between personnel in various functions.

    Handling and custody of diamond gemstones:
  • Achieving specified production requirements.
  • Identify the equipment and explain the specification and functions.
  • Preparation.
  • Examination.
  • Handling of diamond gemstones.
  • Monitoring and control.

    Monitoring processing and impurities:
  • Weight loss.
  • Security requirements.
  • Collection and disposal of diamond dust.
  • Use of tools and equipment.
  • Use of personal protective equipment. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems and make decisions using critical and creative thinking.

    Note: The ability of the candidate to identify impurities in diamond gemstones and be able to take the appropriate action in processing the gemstone, illustrates the capability to solve problems. 

    UNIT STANDARD CCFO WORKING 
    Work effectively with others as members of a team, group, organisation or community.

    Note: The ability of the candidate to communicate effectively and to maintain optimum production illustrates the capability to work effectively with others. 

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage themselves and their activities responsibly and effectively.

    Note: The ability of the candidate to maintain optimum production whilst adhering to safety and security procedures, illustrates the capability to organise and manage themselves and their activities responsibly and effectively. 

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information.

    Note: The ability of the candidate to interpret instructions from the Marker/in the parcel in relation to the stone and implement corrective actions indicates the candidate's ability to analyse, organise and critically evaluate information. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically showing responsibility towards the environment and health of others.

    Note: The ability of the candidate to apply tools and equipment appropriately to effect the polishing of diamonds and to organise equipment and machinery effectively illustrates the capability to use science and technology effectively. 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    Terminology:

    Specified Requirements:

    Specified requirements include legal and site-specific requirements and are contained in one or more of the following documents:

    Legal:
  • The Bargaining Council for the Diamond Cutting Industry Main Agreement.
  • Regulations of the Diamonds Act, No 56 of 1986, as amended.
  • Occupational Health and Safety Act (Act 85/1993).
  • Mandatory Codes of Practice.
  • The glossary of terms about the terminology of the industry issued by the Bargaining Council for the Diamond Cutting Industry.

    Site-specific:
  • Hazard Identification and Risk Assessments (HIRA).
  • Occupational Health and Safety Risk Management Programme.
  • Managerial Instructions.
  • Workplace diamond gemstone security system.
  • Working Guides, tariff agreements, policies and procedures.
  • Equipment and Materials Specifications.

    Unit Standard Justification:

    Level:

    Attribute; Level; Justification:
  • Skills; Level 3; Well developed range.
  • Procedures; Level 3.5; Significant choice.
  • Context; Level 3; Range of familiar.
  • Knowledge; Level 3; Relevant theory is required to address different conditions that may occur in diamond gemstones.
  • Information processing; Level 3; Interpretation of available information.
  • Problem Solving; Level 3; Some limited judgement is required to execute the process effectively.
  • Orientation of activities; Level 2.5; Follows instructions, works under supervision and must refer any abnormal conditions to the Supervisor.
  • Application of responsibility; Level 2.5; Works under supervision and regular quality control inspection is required.
  • Orientation of scope of responsibility; Level 3; Significant responsibility for the quality and quantity of output, and possibility for the output of others in the process.

    Average Level = 26.5/9 = 2.944.
    Actual Level Assigned = 3.

    Credits:

    Total hours required by the learner to achieve the required outcome:

    Activity: Hours:
  • Classroom Teaching: 42 Hours.
  • On-The-Job Training: 100 Hours.
  • Mentoring required: 60 Hours.
  • Other (Home study): 0 Hours.

    Total = 202 Hours.

    Credits Achieved = 202/10 = 20.2.
    Credits Assigned = 20. 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  59851   National Certificate: Diamond Processing  Level 3  NQF Level 03  Reregistered  2023-06-30  MQA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    1. DIAMOND EDUCATION COLLEGE CC 
    2. HARRY OPPENHEIMER DIAMOND TRAINING SCHOOL NPC 
    3. THE KIMBERLEY INTERNATIONAL DIAMONDAND JEWELLERY ACADEMY 
    4. ZUREL PRIVATE COLLEGE 



    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.