Meaning & symbolism
Ruby is the red variety of corundum, aluminium oxide coloured by traces of chromium; every other colour of gem corundum is called sapphire. It forms where aluminium is plentiful and silica scarce, classically in marble (Mogok, Myanmar) and in amphibolite and basalt-related deposits (Mozambique, Thailand, Cambodia). Most rubies glow red under longwave UV light. It is the July birthstone and is often confused with red garnet and red spinel.
Healing properties
Geology
- Corundum, Al2O3, trigonal
- Colour from chromium
- Specific gravity about 4.0
- Refractive index about 1.762 to 1.770, doubly refractive
- Red fluorescence under longwave UV
How to use it
Traditionally worn as jewellery or held in meditation on the root or heart chakra; opaque ruby tumbles and ruby in zoisite are gentle ways to work with it. These are traditional uses, not medical advice.
Cleansing & care
Mohs 9, no cleavage. Clean with warm soapy water. Ultrasonic and steam are usually safe for untreated or heated ruby but never for glass-filled (composite) ruby, which lemon juice and household cleaners can damage. Store apart from softer stones.
