Gemstones are minerals that can be cut and polished to ... of birthstones by month and by zodiac sign. For example, the list ...

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 ...

MISSOULA, Mont. — The Hellgate Mineral Society is hosting Missoula's 30th annual gem, mineral and fossil show this weekend. At the event, residents have the opportunity to shop for gemstones ...