Cut and polish 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 CUVOPA206A, 'Cut and polish 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 'Cut and polish 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. Prepare to cut an opal doublet or triplet

1.1 Identify and obtain consumables required for cutting and polishing an opal doublet or triplet

1.2 Select tools and equipment to be used

1.3 Determine jewellers’ cutting angle requirements

1.4 Dop pre-form on appropriate dop stick using wax or adhesive

2. Cut and polish an opal doublet or triplet

2.1 Grind to relevant shape using colour pattern and play as a guide

2.2 Grind to shape incorporating jewellers’ side angles, including backing into shape

2.3 Dome the top of doublet, leaving a minimum of 1mm above join at side angle

2.4 Sand and polish top and sides of opal doublet

2.5 Turn stone over and re-dop

2.6 Grind, sand and polish backing at jewellers’ angles

2.7 Remove stone from dop and clean

3. Cut and polish an opal triplet commercial top

3.1 Dop stone on top of triplet top

3.2 Grind backing thickness down to approximately 1mm

3.3 Grind edge of backing at approximately 30º until the edge of the triplet top is met

3.4 Sand and polish backing

3.5 Remove stone from dop and clean

4. Cut and polish an opal triplet non-commercial top

4.1 Dop pre-form with glass/quartz on top

4.2 Shape stone like high domed doublet on grinder

4.3 Transform opal colour optically into whole of dome

4.4 Sand and polish top and sides of stone

4.5 Turn stone over and re-dop on top surface

4.6 Grind backing thickness to 1mm

4.7 Grind setting edge angle at 30º, until 1mm into top, under- cutting backing

4.8 Sand and polish bottom and setting edge and remove any chipping that may occur around edge of top

4.9 Remove stone from dop and clean