Crystal and stones » iron http://www.crystalandstones.com Properties of natural crystal precious stones, birthstones, gemstones, lithotherapy, crystal healing, chakras Sat, 28 Jan 2012 13:06:41 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Hardness of gems and jewels http://www.crystalandstones.com/physical-properties/hardness.html http://www.crystalandstones.com/physical-properties/hardness.html#comments Wed, 16 Sep 2009 13:47:09 +0000 precious stones http://www.crystalandstones.com/?p=19 Hardness is perhaps one of the most important features in a stone, especially those of the “gem” series, for no matter how colour, lustre, general beauty and even rarity may entitle a stone to the designation “precious,” unless it possesses great hardness it cannot be used as a gem or jewel.

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