Thread: Calgarypuck's Official Jeweller
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Old 11-17-2016, 10:31 PM   #22
troutman
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Just watched this interesting show on NOVA:

http://www.pbs.org/wgbh/nova/earth/t...arth-gems.html

http://www.pbs.org/wgbh/nova/earth/gemstone-primer.html
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