One feature of compounds made with transition metals is their intense color. There are many examples in nature, including gemstones and paint pigments. Even the color of blood comes from the ...

Rubies are formed of a mineral called ... The color comes from additional traces of chromium and vanadium. Different trace elements can produce other colors, allowing beryl to form semiprecious ...

Even though emeralds and rubies are very different colors, they both have the same secret ingredient in their atomic structure.