Tourmaline
On the label: Tourmaline · Gemstone
What it is
A boron silicate in every color, Mohs 7 to 7.5; pink (rubellite), green and the rare neon Paraíba. Some pink stones are heated or irradiated.
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: Cyclosilicate mineral supergroup. Q179911 →
In the research
5 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Gemmological, Spectroscopic, and Origin Description Studies of Tourmaline from Yunnan, China · Molecules (Basel, Switzerland), 2025
- Photocatalytic purification of vehicle exhaust using CeO(2)-Bi(2)O(3) loaded on white carbon and tourmaline · Environmental science and pollution research international, 2021
- The characterization of natural gemstones using non-invasive FT-IR spectroscopy: New data on tourmalines · Talanta, 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.
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.