KhyatiGems knowledge library
Pearl
Pearls form in mollusks. Cultured pearls involve human intervention in their formation, but cultured does not mean imitation.
AI-assisted source review · 2026-10-16. No named gemologist review is claimed. How this reference was reviewed.
W.carter · CC BY 4.0 · Source · CC BY 4.0
| Material classification | Biogenic material |
|---|---|
| Mohs hardness (reference) | 2.5–3 |
Identity and appearance
Pearls form in mollusks. Cultured pearls involve human intervention in their formation, but cultured does not mean imitation.
Natural versus cultured, freshwater versus saltwater and pearl type are separate descriptive questions. Shape and lustre in a photograph cannot answer all of them.
Care and handling
Use a soft damp cloth, protect from cosmetics and store separately from harder gems. Check stringing and fittings regularly; ask for advice about treated pearls.
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
Read natural or cultured before making comparisons based on shape or lustre. A cultured pearl is formed in a mollusk with human intervention; an imitation is a different product. Freshwater and saltwater descriptions address another part of the formation context. Ask which type is being described and whether any colour treatment is disclosed. A round white appearance alone does not answer these questions. For a strand, ask whether the description applies to every pearl and how any matching, treatment or grading terminology is being used.
Choosing and documenting a piece
Inspect the whole piece, including drilling, stringing, knots and fittings where relevant. The way pearls are mounted can affect cleaning and maintenance as much as the appearance of one pearl. Keep them away from harder jewellery in storage and put them on after cosmetics and perfume. A soft damp cloth is a useful general starting point, but repairs and uncertain treatments call for individual advice. If the strand is a gift, include the care instructions and the written type and treatment description rather than relying only on a decorative certificate or photograph.
Before making a decision
For pearl, 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 Pearl reference Checked 2026-10-16