Learn the difference between allochromatic and idiochromatic gems and why some gem species can occur in many color varieties and others occur only in one.
Behind every mystical gem is a merchant, and since ancient times malachite has been “the salesman's stone.” Learn more about malachite symbolism and lore.
Streak testing is a destructive gemstone test rarely used by gemologists. Most gems leave no streak. Learn which gems do and what color they leave.
Everything you ever wanted to know about malachite. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.