
Hardstone is an unscientific term, mostly encountered in the decorative arts or archaeology, that has a similar meaning to semi-precious stones, or gemstones. Very hard building stones, such as granite, are not included in the term in this sense; only stones which are fairly hard, and regarded as attractive - in effect ones which could be used in ...
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http://en.wikipedia.org/wiki/Hardstone
[musician] Hardstone (real name Mbaruku Harrison Ngunjiri Maina, born August 17, 1977) is a Kenyan musician. His music is a mixture of ragga, reggae and hiphop. He sings in English, Swahili and Kikuyu languages. He is a pioneer urban style artist in Kenya and topped the Kenyan music scene for a while in the late 90`s. He emerged in 1997 wit...
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http://en.wikipedia.org/wiki/Hardstone_(musician)

Gemstone whose colour and formation makes it suitable for carving objects such as urns and also for use in decorative techniques such as inlaid decoration, mosaic and cameo. Typical examples include agate, lapis lazuli and malachite.
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http://www.antique-marks.com/antique-terms-h.html

(from the article `jewelry`) Among the semiprecious stones used in jewelry are amethyst, garnet, aquamarine, amber, jade, turquoise, opal, lapis lazuli, and malachite. Matrix ... Hardstones, or semiprecious stones, constitute a special group, which includes some of the most beautiful and decorative of all substances. The ... [2 rela...
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http://www.britannica.com/eb/a-z/h/16

Stone other than limestone. To class as a hardstone aggregate should have a PSV greater than 45.
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Gemstone whose colour and formation makes it suitable for carving objects such as urns and also for use in decorative techniques such as inlaid decoration, mosaic and cameo. Typical examples include agate, lapis lazuli and malachite.
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http://www.encyclo.co.uk/visitor-contributions.php
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