Prized for its sky-blue color, turquoise has been used in amulets and jewelry since antiquity. The oldest known piece of jewelry is a turquoise and gold bracelet found in the tomb of Zer, an Egyptian queen who lived 7,500 years ago....
(2001) Complete Story
Do you know what diamonds, rubies, and emeralds are? "Jewels" is the answer most people offer. It's an accurate answer, but it doesn't tell the fascinating story behind these treasures from nature.... (2001) Complete Story
The minerals grouped as jasper belong to the quartz family. Quartz is one of the most abundant minerals on Earth. It's formed primarily from silica and oxygen, but includes trace amounts of dozens of other minerals. Because of these ineralogical impurities.... (2002) Complete Story
Lapis lazuli, as lovely as its exotic name, has decorated humans and enhanced their art for thousands of years. Normally a rich deep shade of blue or blue-violet, lapis lazuli may at times have a slight greenish cast.... (2001) Complete Story