Coober Pedy set four opals are hand picked by the opal
cutter to match.
Most are from same mine area in Coober Pedy or source, so
they match closely
Only high-end quality opals are cut as parcel 4 and most are
oval shape with few marquis shapes.
Top end jewellers do like sets 4 opals to make creative,
unique jewelry designs.
Unfortunately, only limited supply is available a snot manty
parcels are cut this way