Many minerals form beautiful crystals, but the most prized of all are gemstones. Uncut gems often look fairly ordinary–like rocks. It's only when they are cut and polished that they obtain the ...

With 450 vendors, the 22nd Street Show is the largest component of the Tucson Gem and Mineral Show. Admission is free, with a $10 parking fee.

When it comes to toughness, jade sits at the top of the hardy gemstone list. This might be surprising ... nephrite jade is the toughest known natural mineral, tougher even than ceramics and ...