Corundum (Ruby)
Corundum
What is Corundum (Ruby)?
Ruby is a gemstone variety of the mineral corundum, prized for its vibrant red color. The red hue is primarily due to the presence of chromium. Rubies are known for their hardness, durability, and brilliance, making them ideal for jewelry. They are often associated with passion, love, and vitality.
Optical Properties
- Refractive Index
- 1.762-1.770
- Birefringence
- 0.008
- Pleochroism
- Strong, red to purplish-red
- Optical Character
- Uniaxial (-)
- Dispersion
- 0.018
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Corundum (Ruby) before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Corundum (Ruby) Localities Map
See where Corundum (Ruby) is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Red, various shades from pinkish-red to purplish-red
- Hardness (Mohs)
- 9
- Density
- 3.97 - 4.05 g/cm³
- Streak
- Colorless
Chemical Properties
- Chemical Formula
- Al2O3
- Elements
- Aluminum, Oxygen, Chromium, Iron, Titanium, Vanadium
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Corundum (Ruby) FAQs
How do I identify Corundum (Ruby)?
Corundum (Ruby) can be identified by its hardness of 9 on the Mohs scale, Red color. Look for these key characteristics when examining specimens.
What color is Corundum (Ruby)?
Corundum (Ruby) typically appears in Red, various shades from pinkish-red to purplish-red. Color can vary depending on impurities and formation conditions.
How hard is Corundum (Ruby)?
Corundum (Ruby) has a hardness of 9 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.