Amethyst
On the label: Amethyst · Gemstone
What it is
Purple quartz, the February birthstone, Mohs 7. Affordable because large clean crystals are common; fades slowly in strong sun over years.
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 of quartz variety. Q79058 →
In the research
5 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
- Preparation and Basic Properties of Praseodymium-Neodymium-Chromium Containing Imitation Gemstone Glass · Materials (Basel, Switzerland), 2022
- Study on the effect of heat treatment on amethyst color and the cause of coloration · Scientific reports, 2020
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
8 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
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.