Materials glossary / Standard and mark
Proposition 65
On the label: Proposition 65 · Standard and mark
What it is
California's law requiring a warning on products that can expose users to listed chemicals, including lead, cadmium and nickel compounds; the warning on a jewelry listing is legal boilerplate for many products and a reason to ask what the metal is.
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: California law passed by direct voter initiative in 1986. Q1869829 →
In the research
1 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Measurement of endocrine disrupting and asthma-associated chemicals in hair products used by Black women · Environmental research, 2018
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.