Citrine
On the label: Citrine · Gemstone
What it is
Yellow to orange quartz, a November birthstone. Most commercial citrine is heat-treated amethyst, which is standard and should be disclosed.
Gemstones: Natural gemstones, as mined and cut. Hardness (Mohs scale) says what scratches what; treatment (heat, oil, dye) must be disclosed under FTC rules.
Wikidata: Mineral, yellow quartz var.. Q334719 →
In the research
7 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Forensic characterization of Brazilian gemstones: A pilot study employing raman spectroscopy and multivariate analysis · Forensic science international, 2025
- Study on the effect of heat treatment on amethyst color and the cause of coloration · Scientific reports, 2020
- Physiological function of photoreceptor UVR8 in UV-B tolerance in the liverwort Marchantia polymorpha · Planta, 2019
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.
Pieces whose listing names it
4 on the siteMatched from the words in the supplier's listing; the full material line is on each product page.
Made in the USA
Made in the USA
Made in the USA
Made in the USA
Other gemstones
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.