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.

Using this item

Te Ara - The Encyclopedia of New Zealand

This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.

All images & media in this story

Me pēnei te tohu i te 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 18 September 2019)

Story by Jocelyn Thornton, published 12 Jun 2006