Gemstone profile and identification guide
Yellow Jasper
Yellow jasper is an opaque chalcedony variety colored by iron-bearing components.
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Overview
Yellow jasper is an opaque chalcedony variety colored by iron-bearing components.
Did you know? Yellow jasper has long been used as a symbolic protective talisman in folk traditions.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Yellow Jasper
Scientific classification: Silicate (Jasper Variety, Opaque Chalcedony)
Hardness: 6.75 Mohs
Transparency: opaque
Lustre: waxy
Crystal system: Trigonal (microcrystalline aggregate)
Primary colour: Yellow
Secondary colour: Mustard Yellow
Colour family: Oranges & Yellows
Opaque yellow body with jasper texture and quartz hardness are primary indicators.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Final remaining profile set completed in targeted pass.
Physical Properties
Hardness category: hard
Hardness value: 6.75 Mohs
Chemical composition: Silicon dioxide (SiO2) with iron-rich pigments
Crystal system: Trigonal (microcrystalline aggregate)
Common locations: India, Brazil, South Africa, United States
Learn more: Gem-A gemstone education resources.
Colour Variations
Opaque yellow jasper with earthy yellow to mustard tones.
Optical effects: None specified in the current dataset.
Detailed Gemology
Mineral species: Quartz (jasper variety)
Mineral group: Quartz group
Chemical formula: Silicon dioxide (SiO2) with iron-rich pigments
Mohs hardness: 6.75
Crystal system: Trigonal (microcrystalline aggregate)
Lustre: waxy
Transparency: opaque
Streak: White
Cleavage: None
Fracture: Conchoidal to uneven
Specific gravity: 2.58-2.64
Refractive index: 1.53-1.54
Optical phenomena: None typically diagnostic
Colour range: Yellow to mustard-yellow
Common inclusions: Species-dependent inclusions and growth features
Geological environment: Species-dependent
Principal mining regions: India, Brazil, South Africa, United States
Important commercial sources: Yellow jasper is globally distributed across silica-rich sedimentary and volcanic contexts
Historical significance: Recognized in gemological and lapidary trade.
Common treatments: Treatment status varies by product; disclose when present.
Synthetic or imitation forms: Imitations may exist depending on species.
Common look-alikes: Species-dependent look-alikes.
Jewellery uses: Yellow Jasper is used chiefly for Earth-tone jewellery and carving stock.. In the trade it is commonly fashioned as cabochons, beads, carvings, and polished ornamental pieces, with Mohs hardness 6.75 guiding suitable jewellery applications.
Care recommendations: Durable for jewellery and carvings; avoid severe impact on thin pieces.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Yellow Jasper.
Formation
Forms through silica deposition/replacement with iron-rich colorants.
Origin
Yellow jasper is globally distributed across silica-rich sedimentary and volcanic contexts
Uses
Best for: Yellow Jasper is used chiefly for Earth-tone jewellery and carving stock.. In the trade it is commonly fashioned as cabochons, beads, carvings, and polished ornamental pieces, with Mohs hardness 6.75 guiding suitable jewellery applications.
Ideal uses: Earth-tone jewelry and carving stock.
Care
Durable for jewellery and carvings; avoid severe impact on thin pieces.
Need another candidate? Use advanced gemstone search or return to the identification guide.
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Yellow Jasper FAQ
How can I identify Yellow Jasper?
Compare hardness (6.75 Mohs), crystal system (Trigonal (microcrystalline aggregate)), colour profile, and lustre (waxy) with your sample. Then cross-check related gemstones listed above.
What colour range does Yellow Jasper appear in?
Opaque yellow jasper with earthy yellow to mustard tones.
Where is Yellow Jasper commonly used?
Earth-tone jewelry and carving stock.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 10 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 10 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 10 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 10 factual verification pass.