Gemstone profile and identification guide
Star Sapphire
Star Sapphire is a Blue, Pink oxide (corundum) prized for its distinctive beauty, historic appeal, and use in fine jewellery and collector pieces.
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Overview
Star Sapphire is a Blue, Pink oxide (corundum) prized for its distinctive beauty, historic appeal, and use in fine jewellery and collector pieces.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Star Sapphire
Scientific classification: Oxide (Corundum)
Hardness: 9 Mohs
Transparency: transparent
Lustre: vitreous
Crystal system: Trigonal
Primary colour: Blue
Secondary colour: Sapphire Blue
Colour family: Blues & Cyans
Physical Properties
Hardness category: very hard
Hardness value: 9 Mohs
Chemical composition: Aluminum oxide (Al2O3)
Crystal system: Trigonal
Common locations: Sri Lanka, Madagascar, Myanmar, Australia
Learn more: Gem-A gemstone education resources.
Colour Variations
Star Sapphire is classified within the blues & cyans palette. Primary colour: blue. Secondary colour: sapphire blue. Optical effects: Asterism.
Optical effects: Asterism
Formation
Formed in metamorphic rock and alluvial deposits, often in pegmatites and basalt flows.
Origin
Sri Lanka, Madagascar, Myanmar, Australia
Uses
Best for: Durable centerpieces for rings and daily wear.
Ideal uses: High-impact settings and heirloom designs.
Care
Avoid harsh cleaners and hard knocks. Use warm soapy water and a soft brush for cleaning.
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Related gemstones by colour
Related gemstones by hardness
Gemstones from the same mineral family
Commonly confused gemstones
Star Sapphire FAQ
How can I identify Star Sapphire?
Compare hardness (9 Mohs), crystal system (Trigonal), colour profile, and lustre (vitreous) with your sample. Then cross-check related gemstones listed above.
What colour range does Star Sapphire appear in?
Star Sapphire is classified within the blues & cyans palette. Primary colour: blue. Secondary colour: sapphire blue. Optical effects: Asterism.
Where is Star Sapphire commonly used?
High-impact settings and heirloom designs.. For maintenance, follow the care guidance in this profile.
Scientific References
Reference data from GIA and Mindat mineral records.