Gemstone profile and identification guide
Durability is part of the appeal of Royal Blue Sapphire, not merely a technical footnote. That combination of blue body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary royal blue note often matters more than people expect when separating it from lookalikes.
Durability is part of the appeal of Royal Blue Sapphire, not merely a technical footnote. That combination of blue body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary royal blue note often matters more than people expect when separating it from lookalikes.
Did you know? Royal Blue Sapphire is commonly associated with material from Sri Lanka, though the broader trade may draw on multiple localities.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Name: Royal Blue Sapphire
Scientific classification: Oxide (Corundum Variety)
Hardness: 9 Mohs
Transparency: transparent
Lustre: vitreous to adamantine
Crystal system: Trigonal
Primary colour: Blue
Secondary colour: Royal Blue
Colour family: Blues & Cyans
A practical identification pass begins with the visible basics: transparent transparency, vitreous lustre, 9 Mohs hardness, and a trigonal crystal system. The interaction between blue and royal blue tones is more useful than the primary colour alone when comparing candidates. Useful side-by-side comparisons include Sapphire, Ruby, Spinel.
Status: verified-family-derived
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity fields inherited from verified parent profile: sapphire.
Royal blue sapphire profile inherits sapphire core identity fields.
Variety-level locality and treatment specifics can differ and should be reviewed before publication-grade claims.
Hardness category: very hard
Hardness value: 9 Mohs
Chemical composition: Aluminum oxide (Al2O3)
Crystal system: Trigonal
Common locations: Sri Lanka, Madagascar, Australia, Myanmar, Kashmir (historic India)
Learn more: Gem-A gemstone education resources.
Royal Blue Sapphire sits in the blues & cyans grouping here, usually reading first as blue with royal blue appearing as a secondary note or modifier.
Optical effects: Asterism (in star sapphire), Colour Change (some sapphires)
Mineral species: Corundum (sapphire variety)
Mineral group: Corundum
Chemical formula: Aluminum oxide (Al2O3)
Mohs hardness: 9
Crystal system: Trigonal
Lustre: vitreous to adamantine
Transparency: transparent
Streak: White
Cleavage: No true cleavage; parting may occur
Fracture: Conchoidal to uneven
Specific gravity: 3.99-4.01
Refractive index: 1.76-1.77
Optical phenomena: Asterism (in star sapphire), Colour Change (some sapphires)
Colour range: Blue, Royal Blue, Sapphire Blue
Common inclusions: Rutile silk, crystal inclusions, and healed fractures
Geological environment: Royal Blue Sapphire occurs in Metamorphic marbles and igneous/metamorphic deposits with alluvial concentrations. Its Trigonal structure reflects the pressure-temperature conditions of those host rocks, with notable occurrences in Sri Lanka, Madagascar, Australia, Myanmar, Kashmir (historic India).
Principal mining regions: Sri Lanka, Madagascar, Australia, Myanmar, Kashmir (historic India)
Important commercial sources: Commercial sapphire is sourced chiefly from Sri Lanka and Madagascar; Australia and Myanmar are also important
Historical significance: Ruby and sapphire are among the most historically significant and durable gem species.
Common treatments: Heat treatment is common; diffusion and fracture-filling treatments may occur and require disclosure.
Synthetic or imitation forms: Synthetic corundum (Verneuil, flux, hydrothermal) and glass imitations exist.
Common look-alikes: sapphire, ruby, spinel
Jewellery uses: Royal Blue Sapphire is used chiefly for A strong candidate for rings and other high-contact jewellery when overall cut quality is sound.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 9 guiding suitable jewellery applications.
Care recommendations: Royal Blue Sapphire should be cleaned with lukewarm water, mild soap, and a soft brush. At Mohs 9 in the Trigonal system, avoid steam cleaners, harsh chemicals, and high-impact wear. Protect cleavage directions from sharp knocks during wear and setting.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Royal Blue Sapphire.
Royal Blue Sapphire is a Corundum (sapphire variety) material with chemistry Aluminum oxide (Al2O3). It develops in Metamorphic marbles and igneous/metamorphic deposits with alluvial concentrations, and economically significant production is associated with Sri Lanka, Madagascar, Australia, Myanmar, Kashmir (historic India).
Commercial sapphire is sourced chiefly from Sri Lanka and Madagascar; Australia and Myanmar are also important
Best for: Royal Blue Sapphire is used chiefly for A strong candidate for rings and other high-contact jewellery when overall cut quality is sound.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 9 guiding suitable jewellery applications.
Ideal uses: A strong candidate for rings and other high-contact jewellery when overall cut quality is sound.
Royal Blue Sapphire should be cleaned with lukewarm water, mild soap, and a soft brush. At Mohs 9 in the Trigonal system, avoid steam cleaners, harsh chemicals, and high-impact wear. Protect cleavage directions from sharp knocks during wear and setting.
Need another candidate? Use advanced gemstone search or return to the identification guide.
Compare hardness (9 Mohs), crystal system (Trigonal), colour profile, and lustre (vitreous to adamantine) with your sample. Then cross-check related gemstones listed above.
Royal Blue Sapphire sits in the blues & cyans grouping here, usually reading first as blue with royal blue appearing as a secondary note or modifier.
A strong candidate for rings and other high-contact jewellery when overall cut quality is sound.. For maintenance, follow the care guidance in this profile.
GIA: general gemstone identity (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: sapphire.
Gem-A: gemological education and terminology (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: sapphire.
Mindat: mineral species and locality index (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: sapphire.
International Gem Society: collector-facing gem reference (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: sapphire.
