Experts Discover Ancient Life Locked Inside a 2.5 Billion-Year-Old Ruby as a Residue In 2021 inside an opulent gemstone, ...

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 ...

Rubies are a red variety of the mineral corundum, which is essentially aluminum ... The intensity of a ruby’s red color can vary based on the concentration of chromium. In fact, the most prized ...