1. hardstone - Noun
2. Hardstone - Proper noun
English Wikipedia has an article on:hardstoneWikipedia
hardstone (countable and uncountable, plural hardstones)
(art) precious stone or semi-precious stone used to make intaglio, mosaics etc.
Hardstone (plural Hardstones)
A surname.
Hardstone carving is the term used in art history for objects produced by the specialised carving techniques, and the techniques themselves. Source: Internet