THE GEMHOOD EDITORIAL LIBRARY
Diaspore gemstone guide
Diaspore — aluminium oxyhydroxide mineral, including some colour-change gem material. Read about characteristic appearance, Mohs hardness, safety and care.
Gem facts · Quality considerations · Care & meaning
A study in colour and character
Every shade has a story.
Typical appearances for Diaspore. Natural stones vary, and lighting or treatment can change their appearance.
Where Diaspore is found
Türkiye (commercial colour-change gem deposits), Russia and other metamorphic localities
Türkiye
Russia
How it forms
Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation.
These are representative geological or commercial sources, not certified provenance for an individual stone. Country of origin should be substantiated independently when relevant to value.
01 / THE GEM AT A GLANCE
What is Diaspore?
Diaspore is aluminium oxyhydroxide mineral, including some colour-change gem material, commonly represented by the formula AlO(OH). Mohs hardness: 6.5–7. Reported colours include Colourless, white, greenish, brown, lavender and rose; some gems change colour under different lighting. Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation. Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour.
Composition: AlO(OH). Scientific properties apply to the mineral or gem type, not as a guarantee about an untested individual product.
Diaspore is aluminium oxyhydroxide mineral, including some colour-change gem material, commonly represented by the formula AlO(OH). Mohs hardness: 6.5–7. Reported colours include Colourless, white, greenish, brown, lavender and rose; some gems change colour under different lighting. Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation. Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour. Characteristic features: Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour. Documented occurrences include Türkiye (commercial colour-change gem deposits), Russia and other metamorphic localities. Localities describe geological reports, not the proven origin of any individual sale item. Named from a Greek word referring to breaking apart under heating; certain Turkish stones became known in jewellery by trade names. Transparent gem-quality diaspore can be used in carefully designed jewellery, but strong cleavage makes some settings prone to cracking. Use a soft cloth and gentle mild-soap cleaning; avoid impacts, ultrasonic cleaners, steam and sudden heat changes. “Zultanite” and “Csarite” are trade names; request precise species and treatment disclosure, and view colour-change under several light sources. Colour change is not an authentication guarantee. Do not equate all diaspore with branded gem-quality material. Specialist testing and chain-of-custody evidence matter for high-value or hazardous materials. Genuine mineral identification requires evidence beyond colour or the appearance of a picture. Read the complete guide before acquiring a specimen.
02 / LOOK CLOSER
Colour, appearance and quality
Characteristic features: Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour. Documented occurrences include Türkiye (commercial colour-change gem deposits), Russia and other metamorphic localities. Localities describe geological reports, not the proven origin of any individual sale item.
Before you choose a stone
Compare images taken in more than one lighting condition, ask for views of the actual item and check how the cut and setting change its appearance. A gemstone type is not a standard grade: each natural specimen has its own colour, inclusions and workmanship.
THE GEMHOOD BUYER'S FIELD NOTES
How to choose Diaspore: three checks
- 01
“Zultanite” and “Csarite” are trade names; request precise species and treatment disclosure, and view colour-change under several light sources.
- 02
Use a soft cloth and gentle mild-soap cleaning; avoid impacts, ultrasonic cleaners, steam and sudden heat changes.
Colour change is not an authentication guarantee. Do not equate all diaspore with branded gem-quality material.
Transparent gem-quality diaspore can be used in carefully designed jewellery, but strong cleavage makes some settings prone to cracking.
These notes describe typical gem material and trade practices. They do not independently grade or identify a specific item offered for sale.
03 / BUY WITH CONFIDENCE
Natural, laboratory-grown, treated or imitation?
“Zultanite” and “Csarite” are trade names; request precise species and treatment disclosure, and view colour-change under several light sources. Colour change is not an authentication guarantee. Do not equate all diaspore with branded gem-quality material. Specialist testing and chain-of-custody evidence matter for high-value or hazardous materials.
These distinctions should be clear in the listing for any particular gem. Treatments are not automatically unacceptable, but an undisclosed treatment, vague mineral identity or unsupported origin claim prevents an informed purchase. Where material identity materially affects value, an independent gemological identification report may be worth considering.
A CLOSER LOOK
Formation and mineral chemistry
Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation.
Diaspore is aluminium oxyhydroxide mineral, including some colour-change gem material, commonly represented by the formula AlO(OH). Mohs hardness: 6.5–7. Reported colours include Colourless, white, greenish, brown, lavender and rose; some gems change colour under different lighting. Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation. Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour.
A CLOSER LOOK
Diagnostic features and lookalikes
Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour.
“Zultanite” and “Csarite” are trade names; request precise species and treatment disclosure, and view colour-change under several light sources.
A CLOSER LOOK
Representative origins and provenance
Türkiye (commercial colour-change gem deposits), Russia and other metamorphic localities
A locality reference does not prove the offered specimen originates there.
A CLOSER LOOK
Uses and jewellery suitability
Transparent gem-quality diaspore can be used in carefully designed jewellery, but strong cleavage makes some settings prone to cracking.
Colour change is not an authentication guarantee. Do not equate all diaspore with branded gem-quality material.
A CLOSER LOOK
Cleaning, handling and storage
Use a soft cloth and gentle mild-soap cleaning; avoid impacts, ultrasonic cleaners, steam and sudden heat changes.
Named from a Greek word referring to breaking apart under heating; certain Turkish stones became known in jewellery by trade names.
A CLOSER LOOK
Specimen image attribution and reuse licence
Specimen image adapted from 'Diaspore, Musee de Mineralogie, Paris, 2025.jpg' by Animalculum on Wikimedia Commons. Licence: CC BY 4.0. Photo has been resized, converted to WebP and presented against a white background.
Original source: https://commons.wikimedia.org/wiki/File:Diaspore,_Musee_de_Mineralogie,_Paris,_2025.jpg ; licence text: https://creativecommons.org/licenses/by/4.0/. The image licence applies to this derivative, not the entire GemHood website.
04 / WEAR IT WELL
Diaspore in jewellery
Transparent gem-quality diaspore can be used in carefully designed jewellery, but strong cleavage makes some settings prone to cracking.
05 / MAKE IT LAST
How to care for Diaspore
Use a soft cloth and gentle mild-soap cleaning; avoid impacts, ultrasonic cleaners, steam and sudden heat changes.
One essential care distinction
Mohs hardness describes resistance to scratching, not resistance to breaking. Gemstones with cleavage, existing fractures, porous surfaces or fillings can need extra care regardless of their hardness number. If you do not know whether a piece has been treated, begin with the gentlest appropriate cleaning method.
06 / CULTURE & MEANING
History, heritage and symbolism
Named from a Greek word referring to breaking apart under heating; certain Turkish stones became known in jewellery by trade names.
Traditional meanings and spiritual associations are part of cultural storytelling. They are not evidence that a gemstone diagnoses, prevents or treats any medical condition.
GOOD QUESTIONS, CLEAR ANSWERS
Diaspore FAQs
What is Diaspore?
Diaspore is aluminium oxyhydroxide mineral, including some colour-change gem material, commonly represented by the formula AlO(OH). Mohs hardness: 6.5–7. Reported colours include Colourless, white, greenish, brown, lavender and rose; some gems change colour under different lighting. Occurs in metamorphosed bauxite and aluminium-rich rocks where high-pressure and temperature conditions promote aluminium oxyhydroxide formation. Prismatic to tabular crystals with one very prominent cleavage direction; selected transparent gems show distinctive lighting-dependent colour.
What is the Mohs hardness of Diaspore?
6.5–7; scratch hardness does not measure toughness or safety.
Where is Diaspore found?
Türkiye (commercial colour-change gem deposits), Russia and other metamorphic localities. Individual provenance must be independently verified.
Is Diaspore suitable for jewellery?
Transparent gem-quality diaspore can be used in carefully designed jewellery, but strong cleavage makes some settings prone to cracking.
How should I store and clean Diaspore?
Use a soft cloth and gentle mild-soap cleaning; avoid impacts, ultrasonic cleaners, steam and sudden heat changes.
How can I identify genuine Diaspore?
“Zultanite” and “Csarite” are trade names; request precise species and treatment disclosure, and view colour-change under several light sources.
What safety or treatment issues affect Diaspore?
Colour change is not an authentication guarantee. Do not equate all diaspore with branded gem-quality material.
A NOTE FROM THE GEMHOOD EDITORIAL DESK
How to use this guide
We explain gemstone properties, known mining regions and customary treatments to help you shop more confidently. Each gemstone can vary in quality and individual provenance, so compare the actual jewellery listing and request supporting documentation if origin, treatment or natural-versus-laboratory-grown status affects your choice.
Our gemstone library is educational and does not act as a laboratory identification certificate. Independent gemological assessment is advisable for valuable or disputed claims.
EDITORIAL REFERENCES
Research and further reading
References describe mineral species and representative occurrences, not verification of any individual item for sale.
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Compare Diaspore with similar gemstones
These stones can overlap in colour, appearance or jewellery use. The mineral identity, treatments and durability may be very different.
KEEP EXPLORING
Other gemstones to discover
Educational articles describe gemstone types and common trade practices. They are not individual gemological certificates, current price appraisals or medical advice.