ruby
Besides the diamonds, rubies are among the hardest materials. While the raw stone looks dull, the sleek stone has a diamond-like luster. Inclusions do not imply a reduction in quality in the case of rubies, but provide an authenticity proof against the synthetic stones.
RUBY
Color: different reds
Mohs hardness: 9
RUBY
Color: different reds
Mohs hardness: 9