Biografie van Gemstone
<b>gemstone</b> or <b>gem</b>, also called a <b>precious</b> or <b>semi-precious stone</b>, is a piece of attractive mineral, which — when cut and polished — is used to make jewelry or other adornments.<a href="http://www.askoxford.com The Oxford Dictionary Online] and [http://mw1.merriam-webster.com/dictionary/gemstone Webster Online Dictionary" target="_blank">[ language{reference} ]</a> However certain rocks, (such as lapis-lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. <br />
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right|thumb|A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. The biggest pebble here is 40 mm long (1.6 inches).<br />
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