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R
is for
Ruby
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Rubies are gemstone quality corundums, a <a href="/p/pink">pink</a> to <a href="/r/red">red</a> stone. They are made from <a href="/a/aluminium">aluminium</a> oxide crystals, with the red colour from traces of <a href="/c/chrome">chromium</a>.
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Gems & minerals
Rubies are gemstone quality corundums, a
pink
to
red
stone. They are made from
aluminium
oxide crystals, with the red colour from traces of
chromium
.
christina rutz
/
CC BY-SA
