A small agate burnisher is a useful tool in the bindery. It's primary job is finishing off the gilding on pagesets, but the pointed tip can also be used for polishing jewellery. It's also a classy paper folder and maybe a letter opener.
The natural agate stone polisher is also the perfect tool for metal clay work.
When used to remove the dirt on all kinds of gold, silver and copper jewelry, just add some water or polishing oil to improve the job.
This tool is about 10cm long,