Materials glossary / Standard and mark
Appraisal
On the label: Appraisal · Standard and mark
What it is
A written valuation for insurance by a graduate gemologist; a paid document, and not the same as a grading report (GIA, IGI), which describes the stone without pricing it.
Standard and marks: The marks, tests and laws behind the words on a label: karat stamps, UV400, ANSI Z80.3, the FTC Jewelry Guides, Prop 65.
Wikidata: Process of estimating what an asset is financially worth. Q4008379 →
In the research
751 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Reported Tetracaine Allergy in Cataract Surgery: A Phenotype-Based Framework for Preoperative Decision-Making · Journal of clinical medicine, 2026
- Regenerative Medicine in Chronic Inflammatory Dermatoses: A Scoping Review · Cureus, 2026
- Eco-Affective Health: Exploring Emotions, Behavior and Well-Being in Sustainability · EcoHealth, 2026
A paper is a paper, not a verdict: titles are listed so you can read them, and a study on one fabric or one filter says little about the piece in your hand.
Other standard and marks
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.