Kōrero: Gemstones

Polishing stones

Well-rounded river or beach stones can be polished using a tumbler. Progressively finer grades of grinding powder are used to develop a smooth surface, and the final polish is achieved with wet polishing powder. This video clip illustrates how a simple vibrating tumbler works.

Te whakamahi i tēnei tūemi

Te Ara - The Encyclopedia of New Zealand

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Te tuhi tohutoro mō tēnei whārangi:

Jocelyn Thornton, 'Gemstones - New Zealand gemstones', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/video/5112/polishing-stones (accessed 30 May 2020)

He kōrero nā Jocelyn Thornton, i tāngia i te 12 Jun 2006