Ruby is the red variety of corundum and one of the most valuable stones — top rubies exceed diamonds per carat.
Colour is king — pure vivid red; avoid brown or too-dark tones. ## Clarity — inclusions are normal; they shouldn't reach the surface. ## Cut or rough — cut is ready to set; rough is for a collection or custom cutting. ## Treatment — heating is standard; glass filling lowers value and must be disclosed.
Frequently asked questions
What ruby colour is most valuable?+
Pure vivid red without brown and not too dark.
