al2o3
aluminum oxide
beauty
birthstone
corundum
crystal
durable
expensive
gem
gemology
gemstone
geology
hard
healing
jewel
jewelry
july
macro
matrix
mineral
minerals
native
natural
nature
precious
raw
red
red corundum
resources
rock
rough
ruby
semiprecious
shine
shiny
starstone
stone
stones
uncut
valuable
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