Elements and Performance Criteria
- Set up faceting equipment
- Select, pre-shape and dop selected opal piece
- Grind, sand and polish pavilion
- Place dopped stone in quill and align to create girdle
- Grind girdle to desired shape on medium to fine lap
- Grind main facets at main angle on medium to fine lap
- Grind girdle break facets at girdle break angle on fine lap
- Grind culet facets at culet angle on fine or pre-polish lap
- Fine lap, pre-polish and polish all pavilion facets including girdle
- Transfer stone
- Grind, pre-polish and polish crown
- Place girdle facet on lap at 90º, index setting 64 or 96 and lock quill
- Grind girdle break facets at break angle establishing girdle thickness, on a medium to fine lap
- Grind main facets at main angle on fine lap
- Cut table facet on fine lap, to 40% of total width of stone
- Pre-polish all crown facets
- Grind star facets using pre-polish lap
- Polish all facets
- Remove stone from dop and clean