Rubies are one of the "precious" gemstones and have been cherrished for centuries. A member
of the Corundum species, rubies are the birthstone for July. Found in various shades of red, their name is
derived from the Latin term for that color. Chromium is the source for the ruby color with iron contributing
to those with more brownish tones.
Besides the diamond, ruby is the hardest mineral, although this will vary in different directions
within the gemstone. Heat treatment is often used to improve coloring. It is common to find
inclusions within rubies. Coloring has a lot to do with the value of rubies, but some of the finest rubies are
not as opaque as the most commonly occurring rubies.
Natural Small Rubies in findings
Lab Created Rubies, emerald cut
Ruby Crystal in Rock
Mohs' Hardness Scale:
Density: 3.97 to 4.05
Transparency: Transparent to