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Evidence Guide: CUVOPA203A - Complete pre-cutting processes for solid opals

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

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CUVOPA203A - Complete pre-cutting processes for solid opals

What evidence can you provide to prove your understanding of each of the following citeria?

Survey market requirements as a basis for making a decision on opal cutting strategy

  1. Establish current client cut and polished opal-buying preferences in the retail and wholesale markets
  2. Determine the internet buying preferences for cut and polished opal
  3. Document client buying preferences for cut and polished opal
Establish current client cut and polished opal-buying preferences in the retail and wholesale markets

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Determine the internet buying preferences for cut and polished opal

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Document client buying preferences for cut and polished opal

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Weigh opal and record information

  1. Weigh opal before cleaning as a basis for determining yield
  2. Record relevant information
Weigh opal before cleaning as a basis for determining yield

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Record relevant information

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Clean and orient opal to determine yields and shape

  1. Make an assessment of the stone and consult with supervisor, colleagues, client or other appropriate persons
  2. Rub down to expose the colour face using appropriate equipment
  3. Determine best orientation for gemstone
  4. Establish the top and bottom of the stone
  5. Remove unwanted material
  6. Check for internal flaws with powerful light source
  7. Cut stone to maximise value, taking yield and colour play into consideration
Make an assessment of the stone and consult with supervisor, colleagues, client or other appropriate persons

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Rub down to expose the colour face using appropriate equipment

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Determine best orientation for gemstone

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Establish the top and bottom of the stone

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Remove unwanted material

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Check for internal flaws with powerful light source

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Cut stone to maximise value, taking yield and colour play into consideration

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Process opal to pre-form state

  1. Remove unwanted material from the planned gemstone using appropriate equipment
  2. Grind to the desired shape
  3. Check for internal flaws and correct if necessary
  4. Follow general OHS principles and safe operating procedures when using tools, equipment and materials
Remove unwanted material from the planned gemstone using appropriate equipment

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Grind to the desired shape

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Check for internal flaws and correct if necessary

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Follow general OHS principles and safe operating procedures when using tools, equipment and materials

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Evidence of the ability to:

apply knowledge of current retail, wholesale and internet buying trends

make decisions on what the final product should be and how to cut the stone to achieve the desired outcome, maximising the yield and colour play from each stone

safely complete cleaning, shaping and pre-forming.

Context of and specific resources for assessment

Assessment must ensure access to:

a computer

an opal-cutting workshop with stones and equipment.

Method of assessment

A range of assessment methods should be used to assess practical skills and knowledge. The following examples are appropriate for this unit:

observation of processes and procedures

oral and/or written questioning on underpinning knowledge and skills

evaluation of the final product

review of portfolios of evidence

review of third-party workplace reports of on-the-job performance by candidate.

Assessment methods should closely reflect workplace demands (e.g. literacy) and the needs of particular groups (e.g. people with disabilities, and people who may have literacy or numeracy difficulties, such as speakers of languages other than English, remote communities and those with interrupted schooling).

Guidance information for assessment

Holistic assessment with other units relevant to the industry sector workplace and job role is recommended.

Required Skills and Knowledge

Required skills

communication skills to:

document buying preferences and technical data

consult with others about opal assessments

critical thinking and analytical skills to assess stones

literacy skills to interpret information about buying preferences

problem-solving skills to identify flaws and maximise yields

numeracy skills to make basic calculations and use numerical features of machinery

technology skills to source information from the internet and use cutting machinery.

Required knowledge

characteristics of opal gemstone structure

importance of achieving yield when cutting a gemstone

market trends and industry requirements for opal products

safety issues associated with opal-cutting machinery.

Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Determining opal-buying preferences may involve:

accessing internet auction sites

accessing internet opal-specific sites

making contact with opal dealers

making contact with opal cutters

phoning jewellery wholesalers and other jewellers

talking with local jewellery store owners

targeting specialist opal stores.

Relevant information to be recorded may include:

date of purchase

description of stone

description of area where mined

mining lease number

number of classes

purchase price

vendor

weight.

Appropriate equipment may include:

cleaning equipment

diamond grinder

diamond saw

free-hand saw

silicon carbide grinder

slab saw

trim saw.

Unwanted material may include:

cracked material

iron stone

materials with inclusions or stains

matrix

poor colour

potch

sandstone.

General OHS principles and safe operating procedures may include:

complying with safe operating procedures for each machine

good housekeeping, in particular avoiding contaminants

using personal protective equipment (PPE) where required.