$5.00 auctions have been popular with wholesalers or resellers to re sell these opals as most are priced as introduction to opals. Or even for buyer winning their first opal as they are good values. Opals are from mixed opal fields, from solid opals from opal fields at boulder opal ,black opal ,cober pedy opal,crystal opals to doublets so please read description carefully. Source your opals direct from opal miners and opal wholesalers and dealers.