Definition
The red variety of corundum colored by chromium, valued for vivid saturation and durability.
Key Features
- Hardness 9 on Mohs scale
- Chromium causes the red hue
- Most prized color is vivid pigeon blood red
- Often heat treated to enhance color and clarity
Origin and History
Historically sourced from Myanmar. Important deposits also occur in Mozambique, Thailand, and Vietnam.
Buying Guide
Seek vivid saturation and good transparency. Confirm enhancements and request reputable reports for high value stones.
- Prefer strong red with minimal brown or purple modifiers
- Assess clarity and avoid heavily fractured stones
- Confirm treatment disclosures and certification
Care and Maintenance
Use mild soap and soft cloth. Avoid harsh chemicals and extreme heat especially if fractures or glass filling are present.
Related Comparisons
FAQs
What gives ruby its red color
Chromium trace elements in corundum produce the red hue.
How are rubies graded
Color saturation, clarity, cut, and carat weight drive value. Vivid transparent stones command premiums.
Is heat treatment common in ruby
Yes. Heat is common and should be disclosed on reports.