Complete pre-cutting processes for opal doublets and triplets

Formats and tools

Unit Description
Reconstruct the unit from the xml and display it as an HTML page.
Assessment Tool
an assessor resource that builds a framework for writing an assessment tool
Assessment Template
generate a spreadsheet for marking this unit in a classroom environment. Put student names in the top row and check them off as they demonstrate competenece for each of the unit's elements and performance criteria.
Assessment Matrix
a slightly different format than the assessment template. A spreadsheet with unit names, elements and performance criteria in separate columns. Put assessment names in column headings to track which performance criteria each one covers. Good for ensuring that you've covered every one of the performance criteria with your assessment instrument (all assessement tools together).
Wiki Markup
mark up the unit in a wiki markup codes, ready to copy and paste into a wiki page. The output will work in most wikis but is designed to work particularly well as a Wikiversity learning project.
Evidence Guide
create an evidence guide for workplace assessment and RPL applicants
Competency Mapping Template
Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners. A template for developing assessments for a unit, which will help you to create valid, fair and reliable assessments for the unit, ready to give to trainers and students
Observation Checklist
create an observation checklist for workplace assessment and RPL applicants. This is similar to the evidence guide above, but a little shorter and friendlier on your printer. You will also need to create a seperate Assessor Marking Guide for guidelines on gathering evidence and a list of key points for each activity observed using the unit's range statement, required skills and evidence required (see the unit's html page for details)

Self Assessment Survey
A form for students to assess thier current skill levels against each of the unit's performance criteria. Cut and paste into a web document or print and distribute in hard copy.
Moodle Outcomes
Create a csv file of the unit's performance criteria to import into a moodle course as outcomes, ready to associate with each of your assignments. Here's a quick 'how to' for importing these into moodle 2.x
Registered Training Organisations
Trying to find someone to train or assess you? This link lists all the RTOs that are currently registered to deliver CUVOPA205A, 'Complete pre-cutting processes for opal doublets and triplets'.
Google Links
links to google searches, with filtering in place to maximise the usefulness of the returned results
Reference books for 'Complete pre-cutting processes for opal doublets and triplets' on This online store has a huge range of books, pretty reasonable prices, free delivery in Australia *and* they give a small commission to for every purchase, so go nuts :)

Elements and Performance Criteria

1. Select opal for cutting as an opal doublet or triplet

1.1 Select suitable materials for cutting as a doublet or triplet based on market requirements and characteristics of the stone

1.2 Determine best play of colour and mark that side

1.3 Check for flaws with powerful light source and correct if necessary

1.4 Follow general OHS principles and safe operating procedures when using machinery for opal cutting

2. Flatten opal and base

2.1 Flatten opal on marked side until surface is free of potch and impurities and is completely down to the colour bar using appropriate equipment

2.2 Select backing materials and flatten

2.3 Lap opal and base until flat satin finish is obtained

2.4 Clean and dry opal and base

3. Cement components together

3.1 Blacken flattened surface with appropriate blacking agent

3.2 Mix adhesive in line with manufacturers’ instructions

3.3 Ensure stone is cemented with the best colour face down

3.4 Cement flattened surfaces together eliminating excess adhesive and air bubbles

3.5 Allow adhesive to harden following manufacturers’ instructions

4. Pre-form opal doublet

4.1 Grind stone to expose join between opal and backing

4.2 Grind stone to expose best colour

4.3 Grind to rough shape

5. Convert doublet to triplet

5.1 Manufacture a triplet working with a very thin opal layer

5.2 Lap the colour surface of the opal until a thin layer of opal remains on the backing

5.3 Clean and dry stone

5.4 Cement manufactured triplet top or preferred alternative to the opal surface, eliminating excess adhesive and air bubbles

5.5 After curing, grind the stone to expose both joins