Opal Shells are shells that have been opalaized.Most opal shells are from Coober Pedy opal fields and few black opal shells from Lightning Ridge are very valuable. Outback deserts of Australia were once under the sea, that is why we now find shells Opalized in the deserts. Source your Opal Shells opals direct from opal miners and opal wholesalers and dealers for your single gem opal shell or parcel opal shells.