Skip to main content Skip to navigation Skip to site search



Typically red, sometimes with hints of brown, purple or pink; must meet certain hue and color saturation standards to be called a ruby and not a sapphire.

Gem family:

Corundum. Ruby is the red variety of corundum; all others are sapphires.




Ruby has held high value throughout recorded history. Ruby has long been associated with passion and desire, as well as with courage and power.

Use in jewelry:

Because of its beautiful red color and its long association with passion, desire and love, ruby is a natural fit as a romantic jewelry gift.

Mohs hardness:

9 (1 softest to 10 hardest)

Common treatments:

Heat treatment is commonly employed to intensify color and dissolve impurities. Ruby can also be diffusion treated to add color to the stone. All treatments must be disclosed.


Clean with mild soap and a soft cloth. Steam and ultrasonic cleaning is safe for untreated and most heat-treated ruby.

Was this article helpful?

Share the wisdom

Email this Article

* Required Fields

More on this topic