KhyatiGems knowledge library
Turquoise
Turquoise is a blue to green gem material whose appearance may include a visible matrix. Porosity and treatment affect practical care.
AI-assisted source review · 2026-10-16. No named gemologist review is claimed. How this reference was reviewed.
Lê Phạm Gia Hy · CC BY-SA 4.0 · Source · CC BY-SA 4.0
| Material classification | Turquoise |
|---|---|
| Mohs hardness (reference) | 5–6 |
Identity and appearance
Turquoise is a blue to green gem material whose appearance may include a visible matrix. Porosity and treatment affect practical care.
Stabilization, dye and imitation are different descriptions. A matrix pattern does not establish a mine or prove that material is untreated.
Care and handling
Protect against cosmetics, chemicals and heat. Obtain treatment details before cleaning and avoid assuming all turquoise can be immersed safely.
Questions for an individual stone
Keep the material name, natural or laboratory-grown origin, treatment description and any report together. Ask which conclusions were established by examination and which remain unknown. The reference properties here describe a material; they are not measurements of a stone offered for sale.
If a description and report disagree, request clarification before making a decision. Photographs are useful for discussing appearance, but cannot authenticate a specimen. Keep care instructions with the item so that a jeweller or repairer can assess it before work begins.
Comparison and interpretation
Compare an identification with the treatment description, because both matter for turquoise. Stabilized material, dyed material and an imitation are not interchangeable labels. Ask whether the actual turquoise was identified, what treatment is known and which components of a composite object were examined. A visible matrix may be part of a piece’s appearance, but it does not certify a mine. Marketing names that suggest a locality should be supported separately. Consider the written evidence before treating a pattern seen in a photograph as a geographic fingerprint.
Choosing and documenting a piece
Plan everyday handling around potential contact with cosmetics, skin products, chemicals and heat. Before cleaning a strand or mounted gem, ask about porosity, treatment and the condition of fittings or adhesives. Do not assume that a cleaner suitable for another blue stone is suitable here. A reference hardness describes scratching resistance in general, not the full durability of an individual object. Keep treatment details with the piece so that a jeweller can make an informed care decision. Where the treatment history is unknown, preserve that uncertainty in the record.
Before making a decision
For turquoise, ask the seller to identify the actual item, state what remains unknown and explain the scope of any report. Keep photographs, measurements and written disclosures together. If an answer matters to your decision, obtain it before commissioning a setting or arranging a repair.
Sources and further reading
- GIA Turquoise reference Checked 2026-10-16