There ya go. You have your first sample set. Quartz is a 7.00 on the hardness scale and topaz is 8.00. Find a few other gemstones and you can have a pretty nice set to check your stones with.
Here's a hardness scale on line for gemstones.
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http://www.gemstone-magic.com/mohs-scale-index.html
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http://www.thunting.com/smf/index.php/topic,26295.msg185192.html#msg185192
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