TUCSON, Ariz.To experience the gemstone trade in all its polyglot glory, jewelers from around the world have a beloved annual ritual: For about three weeks every year, starting in late January, they flock to this city in the Sonoran Desert.That is when tens of thousands of people with a stake in the gem business miners, cutters, dealers, retailers, designers and collectors arrive in southern Arizona to buy and sell colored stones at dozens of gem and mineral shows staged in hotel rooms, parking lots and tents across town.
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