Natural specimen, illustrative.
Corundum · Mohs 9
Sapphire
Corundum in colours other than ruby red. Blue is its most familiar colour, but fancy sapphires span many hues.
- Composition
- Al2O3
- Hardness
- 9 on the Mohs scale · scratch resistance, not toughness
- Birthstone
- September
- Care
- Clean gently with a soft cloth and mild soapy water; rinse briefly and dry. Avoid heat, chemicals, ultrasonic cleaning and hard impacts. Ask about treatments before cleaning.
- Paired with
- Virgo
- Symbolic
- Expression, Reflection · Throat, Third eye chakras. Design vocabulary, not a physical effect.
Pairs well with
Stones that share its meaning.
Amethyst
Quartz · Mohs 7
Calm · Evening ritual · Reflection
Aquamarine
Beryl · Mohs 7.5–8
Calm · Expression
Moonstone
Feldspar · Mohs 6–6.5
Evening ritual · Reflection
Topaz
Topaz · Mohs 8
Expression · ConfidenceGem properties describe materials. Chakra and intention pairings are symbolic traditions and Mulu design choices, not measured energy or medical effects. Stones are not proven to treat disease or improve sleep.