Gemstone profile and identification guide
Violet quartz earns its place in both jewellery and mineral collections through colour rather than rarity. The appeal of amethyst lies in how evenly or intensely that purple is distributed, from pale lilac material to richly saturated stones cut for statement pieces.
Violet quartz earns its place in both jewellery and mineral collections through colour rather than rarity. The appeal of amethyst lies in how evenly or intensely that purple is distributed, from pale lilac material to richly saturated stones cut for statement pieces.
Did you know? Many famous amethyst deposits formed inside volcanic cavities, where crystals had room to grow inward and line entire geodes.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Name: Amethyst
Scientific classification: Silicate (Quartz)
Hardness: 7 Mohs
Transparency: transparent
Lustre: vitreous
Crystal system: Trigonal
Primary colour: Yellow
Secondary colour: Purple
Colour family: Oranges & Yellows
Look for quartz hardness, vitreous lustre, and purple body colour that may zone rather than remain perfectly uniform. It is often distinguished from purple glass by its greater hardness and from fluorite by its better durability.
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity fields reviewed against consensus gemological references (GIA/Gem-A/Mindat/IGS).
Some market- and locality-level details may still require citation-grade source notes for publication workflows.
Hardness category: medium
Hardness value: 7 Mohs
Chemical composition: Silicon dioxide (SiO2)
Crystal system: Trigonal
Common locations: Brazil (Rio Grande do Sul), Uruguay (Artigas), Zambia, Bolivia, Madagascar
Learn more: Gem-A gemstone education resources.
Amethyst sits in the oranges & yellows grouping here, usually reading first as yellow with purple appearing as a secondary note or modifier.
Optical effects: Colour Zoning (common)
Mineral species: Quartz
Mineral group: Quartz group
Chemical formula: Silicon dioxide (SiO2)
Mohs hardness: 7
Crystal system: Trigonal
Lustre: vitreous
Transparency: transparent
Streak: White to colorless (species-dependent)
Cleavage: Species-dependent cleavage behavior
Fracture: Conchoidal to uneven
Specific gravity: Species-dependent range; see cited references
Refractive index: Species-dependent range; see cited references
Optical phenomena: Colour Zoning (common)
Colour range: Yellow, Purple, Violet
Common inclusions: Natural growth features, inclusions, and fracture signatures typical of the species/material
Geological environment: Formation in igneous, metamorphic, or sedimentary settings depends on species/material type
Principal mining regions: Brazil (Rio Grande do Sul), Uruguay (Artigas), Zambia, Bolivia, Madagascar
Important commercial sources: Brazil and Uruguay are major commercial sources; additional production from Zambia, Bolivia, and Madagascar
Historical significance: Documented use in gem, ornamental, or collector contexts.
Common treatments: Treatment practices vary by market and species; disclosure is required when present.
Synthetic or imitation forms: Synthetic and imitation products may be present depending on species/material category.
Common look-alikes: citrine, jasper, agate
Jewellery uses: Amethyst is used chiefly for Often best in pendants, earrings, collector cuts, and occasional-wear rings that showcase colour without unnecessary risk.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 7 guiding suitable jewellery applications.
Care recommendations: Clean with warm water and mild soap; avoid extended exposure to direct sunlight for dyed varieties.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Amethyst.
Crystallizes from silica-rich fluids in hydrothermal veins, geodes, and pegmatites. That growth history is consistent with a crystal habit capable of producing prismatic or granular material depending on how much space the host environment allowed.
Brazil and Uruguay are major commercial sources; additional production from Zambia, Bolivia, and Madagascar
Best for: Amethyst is used chiefly for Often best in pendants, earrings, collector cuts, and occasional-wear rings that showcase colour without unnecessary risk.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 7 guiding suitable jewellery applications.
Ideal uses: Often best in pendants, earrings, collector cuts, and occasional-wear rings that showcase colour without unnecessary risk.
Clean with warm water and mild soap; avoid extended exposure to direct sunlight for dyed varieties.
Need another candidate? Use advanced gemstone search or return to the identification guide.
Compare hardness (7 Mohs), crystal system (Trigonal), colour profile, and lustre (vitreous) with your sample. Then cross-check related gemstones listed above.
Amethyst sits in the oranges & yellows grouping here, usually reading first as yellow with purple appearing as a secondary note or modifier.
Often best in pendants, earrings, collector cuts, and occasional-wear rings that showcase colour without unnecessary risk.. For maintenance, follow the care guidance in this profile.
GIA: general gemstone identity (reviewed) - Reviewed as a direct core gemstone profile.
Gem-A: gemological education and terminology (reviewed) - Reviewed as a direct core gemstone profile.
Mindat: mineral species and locality index (reviewed) - Reviewed as a direct core gemstone profile.
International Gem Society: collector-facing gem reference (reviewed) - Reviewed as a direct core gemstone profile.
