Visual Identification Limits | ICHA Crystal Guide

Visual evidence boundary

Visual Identification Limits

A photograph can help you notice color zoning, fractures, bubbles, coating wear, surface texture, clarity, and luster. These observations are useful when comparing listings, but they do not by themselves establish what a stone is.

Two similar polished stones viewed under neutral light, showing different surface texture, internal features, and uncertain identification — Similar appearance can support a comparison question without resolving identity. Seller wording, additional views, measurements, disclosure, and testing may change what can reasonably be concluded.

Limits

What an image cannot establish

Definitive identity, natural origin, authenticity, treatment status, provenance, grade, or value.
Whether a uniform color, bright surface, or inclusion pattern has a natural or treated explanation.
Whether a seller's label is accurate when the listing does not disclose material, treatment, or construction details.

Reader use

How to use visual clues responsibly

Treat the photograph as an observation source, not a verdict. Record what is directly visible, separate it from what the seller states, and note which alternatives still fit the same appearance. Ask for clearer views, dimensions, treatment disclosure, and return terms when those details affect the purchase decision.

When a definitive answer matters, testing is needed to confirm the material. A visual comparison can identify a useful question, but it cannot replace appropriate gemological examination.