Precious gems are formed in different ways and composed ... Rubies are formed of a mineral called corundum, comprised of aluminum oxide. The red color is caused by traces of chromium.

As is the case with many stones, an amethyst's value is determined by several factors, including color, clarity, carat, and ...

When it comes to brightening your front yard flower beds, jewel tone plants can make a significant impact. But which ones create the most stunning displays?