Rubies are mainly made up of the mineral corundum ... The chromium replaces about 1% of the aluminum in the corundum or beryl crystal when a ruby or emerald forms underground at a high temperature ...

Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow: red, ...

Like their gemstone cousin the sapphire, rubies are just a variety of corundum, or aluminum oxide ... was rewarded with a large, deep pink ruby. This looks like a fun, quick little project ...

Advertisement Both rubies and emeralds are minerals, which is a type ... replaces about 1% of the aluminum in the corundum or beryl crystal when a ruby or emerald forms underground at a high ...