Definition of potch in English:


(also potch opal)


  • [mass noun] Opal which has no play of colour and is of no value.

    • ‘It often serves as an excellent dark backing for black opals which normally have a thin segment of precious opal naturally formed on a potch backing.’
    • ‘One potential use of common or potch opal is for the production of cristobalite for use as a dental and jewellery investment.’
    • ‘They usually consist of a very thin opal slice sandwiched between a glass or quartz top and a potch, basanite, jade, or black onyx bottom.’


Late 19th century: of unknown origin.